I am asking for help with my father’s treatment (prayers, advice, financial assistance).

Eternal memory to your father, Armag! Those who have not lost a dear person will not understand your pain. Angels and all heavenly forces are with you now. Try to think not only about the loss. Try to be grateful. God gave your father years of life. You had the opportunity to love your father. Think of orphans who never got to say "Mom, Dad..." Think of children who lose their parents at that early, innocent, defenseless age, when there is no way to answer for themselves the terrible questions of why everything happened this way... But you are now a formed man with your own charisma, courage, and willpower. You are now the head of the family. Everyone you love relies on you.
You know the saying that heroes never die. You will remember your father all your life, and he will be with you too. He will watch over your every step from heaven, will be proud of you, will rejoice with you in your moments of joy, and will protect you and those close to you. Just remember how your father raised you, what kind of person he wanted you to be. Try to give this world more love!
And from myself, I will add the humble gratitude of a simple hero fan for all your mighty work in developing our beloved game. Thank your father for such a son!