I am very close to my mother: she would be a good friend of mine even it we were not related to each other. She is 78, bedridden, incontinent and with a failing short-term memory. I would not want to devastate her and force her to enter a convalescent home, which is what would happen if I were to ctb while she is still alive. My maternal grandmother ctb at the age of 70 and my maternal grandfather died in an accident in his 60s: my two maternal aunts who have died did so in their 70s (another two maternal aunts are still alive, but in poor health). I don't know how much longer Mom will live. With any luck, she could live another 10 or even 20 years.
Oh! Won't God allow me to go to Heaven before the year 2038? I want Mom to be in Heaven already when I die. Ah well!