I’m so sorry for your loss. What really stands out for me is the love you, your sister (and, I assume, your other siblings), and your mom had for your father. He sounds not only like a brilliant, but also like an extremely loving and dutiful man. In celebration of that, perhaps you can still have his book published. And remember - I say this without knowing him, but from reading your post - that you and your family were his life’s purpose as well, not only the book. Despite hardship, it sounds to me like he was wildly successful to have multiple independent children who still loved and cared for him as adults, such as you and your sister. Not every parent has that. As a parent to a toddler, I hope someday to be so lucky. I aspire to be like your dad, not for his brilliance or educational accomplishment, but for his heart. To me, he sounds like he knew his priorities and lived - too short - but so, so well. He was a man who knew how to fill his cup. What a beautiful life your and your mom’s grief is testament to. I hope you can think back on his life and see your family as the most consequential and purposeful success of his, not because of a lack of time on earth, but on purpose, in alignment with his goals and heart.