I had the distinct privilege of working with Frank early in my legal career.  He was uniquely supportive of my legal pursuits and was an unwaivering and consistent encourager.  I could always rely on him.  I shall miss him and his infectious laugh!

Dear Siderius family.
The Larsen family was saddened to hear about Frank’s passing. Our families, and especially our parents respectfully, enjoyed sharing a small, quaint common backyard fence between our homes for many decades. Frank, a bit older, and I shared several mutual friends. We always enjoyed our time together when when our paths crossed.  Many had a great respect for Frank and many more will miss him. 
Our condolences and every good wish. Sincerely, the family of Stanley and Olive Larsen.

Frank was one of the first guys to welcome me at Prep and that meant so much too me, since i didnt know a lot of the students. He was a true friend, and used come watch me play tennis at Woodland Prk. during our college days. I remember him loving the sport,so loved helping  him improve his game. A true and great friend who always had time for his classmates. Have love for Frank !!!!
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Frank was such a nice guy and great coach. He is an amazing person.  He has been there for all of us.   He always treated me like family and I got to go on trips and fun outings with the family.  We are all going to miss him very much.  Frank is looking down on us every day.  I am glad that I have been in his life and his family.

Frank was an extraordinary man. His kindness, humbleness, and calming effect were always present during conversations. His dry sense of humor was very entertaining, we shared great laughs.  I had the honor of being a friend of his at St Anne’s and hanging with him the summer of 7th-8th grade, at high school football games and dances. I have great memories of him along with the Siderius family at St Anne’s events. Frank will be sorely missed, but never forgotten. My thoughts and prayers are with all the family during this difficult time.
Cathy Pugel Stangland

So sorry to hear of Frank’s passing. He was a wonderful guy . I was a classmate at  Seattle Prep 1966-1967

Frank and Maureen were our Dear neighbors in Lake Chelan. 
We miss them everyday.
Dear Frank Rest in Peace.

Phil and Neda Sifferman

Frank's influence on Doney Coe Pet Clinic is immeasurable. Since assuming a role on our board of directors in January 2018, he has played a pivotal role in steering the course of our organization. His almost magical knack for guiding us in the right direction is a testament to his extraordinary leadership abilities. In moments of deviation from our intended path, Frank's wisdom and humanity acted as a compass, consistently realigning us with our shared mission and values. Frank possessed the unique ability to dispel negativity and manifest positive outcomes. 

Reflecting on Frank's contributions, it becomes clear that we were not just colleagues; we were fortunate to have him as a mentor and friend. Despite facing personal challenges, his unwavering dedication to our cause demonstrated a resilience that inspired us all. As we grapple with this profound loss, we will cherish memories of Frank's positive impact on the pets and people served by Doney Coe Pet Clinic and on us as individuals dedicated to serving the community. 

We are grateful that Frank's family selected Doney Coe Pet Clinic as a beneficiary in his memory. We will work diligently and humbly to earn the trust of those who cherish Frank. We commit to continue with the humanity, compassion, and wisdom that would make Frank proud.

Our heartfelt condolences go out to Mo, the love of his life, and his beloved family as they mourn the passing of an extraordinary human being.

Frank was a couple years ahead of me in school, but we both served in CYO Teen Club. Even at the young age of 17, he was a force to be reckoned with.  Our respective families were both Queen Anne/St. Anne's kids and I was friends  with Frank's younger sister, Mary.   Such a small world, as years later, my children went to school with the Kocer kids at Assumption.  Frank and I were both attorneys, and occasionally crossed paths.  Frank was a well respected  attorney with  a deep commitment to pro bono work.  Mo was the  play director when my daughter, Betsy, was at Blanchet.  I thought it was so cool that Frank and Mo got together.  It's funny how small our Catholic world is.   I had no idea Frank had been sick and was saddened to hear of his passing.  My heart goes out to his family.  You are all in my thoughts and prayers.

Shaun Watchie Perry

The loved ones in Frank's life were especially blessed to have him always on their side and having their backs. The world is better for his life in it. I am so sorry for your loss but memories are pretty wonderful after the grief passes to a lesser degree

Dear Siderius Family,
Thinking of all of you at this very difficult time.  
You are all in my prayers and thoughts.  
Even though I won’t be in Seattle for the Mass for Frank, know that I will be remembering you all.
God Bless.

Peace,
Kathy O’Brien Kirschner

Dear Frank, we lost you way too soon.  Not only were you a great guy but also one of the finest lawyers I ever knew in the 5 Northwestern states where my practice took me.  When I retired 10 years ago, I knew you were the one I could recommend to my former clients and others who asked for a referral to a Seattle based lawyer.  In those last 10 years, we had 100's of contacts with each other, and as always your common sense and reliability gave me great confidence in your ability to get the job done fairly.
I grieve for Maureen's and your family's loss.  We remembered you in our prayers at dinner when we first were told of your disease.  Now we will remember Maureen and your family.  Say hello to Ray and Rosemary for me.  God bless you Frank.
Dick

Having lost contact with the Mershon side of my family since childhood, me, my sister and brother-in-law flew to Seattle from Chicago and Ohio, to finally meet our cousin Maureen.  A wonderful reunion dinner at their home, where we told family stories that delighted Frank.  Second trip to Lake Chelan and more stories. Getting ready to go out, I couldn't locate my mascara. Frank had to run to the store for something and he brought me back a tube of mascara, I was touched and never forgot.  Our last night in Lake Chelan, sitting under blankets on chaise lounges looking at the stars.  Such wonderful memories and I wish we had more time with him, but so happy for the time spent.   Donna Bauer, Dayton, Ohio

To Mary, Barb, John and family I am so sorry to hear about Frank's passing I knew of Frank at Seattle Prep and worked with and for him at Tabard Inn at Seattle University.  He is in my thoughts and prayers

My deepest condolences to Mo and the rest of Frank’s family. I was the director at Banchero Disability Partners during Frank’s board service there. Frank gave his time and talents freely and never sought recognition. He kept us legal compliant and well organized with various incorporation documents, registrations and sound advice. He was committed to safe and secure housing for our clients who have developmental disabilities, and helped us to purchase not one but two apartment buildings, donating legal services for both. We were lucky to have his down to earth and humorous counsel that kept even tough times in perspective.
Frank came to all agency events and was known and loved by our staff, client’s and their families. He encouraged his family and others to join in supporting us and we have fond memories of his dad Ray playing piano at the wine tasting events, and he and Maureen dressing up at themed auctions. Always up for fun, Mo and Frank came as Tweedle Dee and Tweedle Dum to our Mad Hatter’s Tea Party Auction in the same hall that his memorial reception will take place next week.
Banchero Disability Partners is honored that Frank’s family has directed memorials to us as one of their suggested charities, and grateful that we got to know and spend time with such a great man.

Seems just like yesterday Frank and I were roaming the halls of Seattle Prep wondering if we would make it through four years of this. Even in death Frank is still the calming influence he was throughout his life and reflecting upon that puts the issues of everyday life in their proper perspective. I feel sadness at his loss, especially for his family, as well as for those of us who were lucky to know him. Missed but never forgotten. Seems just like yesterday....

I had the honor of being friends with Frank at St. Anne's and Seattle Prep, running cross country with him for the four years we were at Prep.  One of my oldest realizations about Frank is that he was a natural leader, someone with good values who put them into action.  Full of warmth and humor, he was also someone you wanted to hang out with and support.  Such a great loss.

RIP  Frank. You were my classmate at St. Anns and Seattle Prep and were one part of the only 2 Franks at Prep. We used to laugh about that... Also, your family moved next door to our house on QA Hill and your siblings and parents were terrific. Frank, you were a stand-up guy and will be sorely missed in this troubled world.  


Peace and love to all who were touched by him.

I ran track with Frank in high school .On the way back to Prep ,Frank would lead us in singing California Dreaming on the bus.I heard that song come on my Alexa the other day and thought I haven't spoken to Frank in awhile so why not give him a call? To my surprise Mo answered and told me he had passed earlier. I was very sad to hear this man who was so kind to everyone was no longer with us. She did comment on the fact that Frank was looking out the window at the leaves , maybe he was thinking of the song. God bless Frank . Solmar Porras

Frank was the best soccer coach he was friendly caring and everything he was the best guy of a coach you dearly will be missed

I knew Frank through Mo. He was always so kind, welcoming, and accepting. Never instantly felt more at ease with anyone. The world needed kindness, and the world had Frank.

It mary whissiel. Frank was a great coach. One of my favorites. He will be missed.so eorry for your loss. If there any thing you need please reach put

I am so sorry for this tremendous loss. Frank was wonderful and I will always remember him fondly.  I will especially miss when he'd see me he'd say with such enthusiasm - "Lutzy!"  Your family continues to be in my thoughts and prayers. Soar high and rest peacefully, Frank. You will surely be missed by many.

Barbara and family,
So sorry to hear you lost your big brother. I didn't know him but from reading about him learned he led a rich and faith-filled life.

This world just lost an Angel. Frank made this place better for so many through his generous works, kindness, and talents. We’re better people because of the role model Frank was. The love and respect he always showed for his wife, Mo, never went unnoticed. His smile could make you feel safe and seen. The memories we made with Frank will live on, which is comforting. May we all continue to share them with others and reflect on the good things he left behind. We wish more people were like Frank. This world would certainly be a much better place.

OBITUARY

Frank Raymond Siderius

3 January, 1952 – 8 November, 2023

Butterworth Funeral Home - Arthur A Wright Chapel & Queen Anne Columbarium

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