Life
I darned near died a month back. Coma, hospital stay, the works. This means I'm not writing as much or as fast as I planned, but I'm still writing almost everyday. (But not tomorrow.)
Most things that do not concern nearly dying do not slow my writing. Usually just the opposite. Problems, trials, relatives (Dead or otherwise.), children, all make we want to write more.
Problems and trials are a reason to write, for me. While writing, I can think of something besides problems and trials.
Relatives also seem a poor excuse not to write. I can care for them, mourn them, listen to them, etc. more than enough without sacrificing writing time.
Children are a responsibility I take care of largely by writing, and by example. Showing up to do what needs to be done, when it needs to be done, no excuses, is one of the best examples I can set. And I'm sure not going to leave much of a legacy by letting anything stop me from writing.
It is a matter of just get on with it. It isn't always simple, and it's seldom easy, but it always comes down to one choice. . .you write, or you don't write.
I have a pretty simple rule. If it would not stop me from showing up at my day job, then it should not stop me from showing to write, either.