As soon as someone inflicts their personal problems on you, time to bitch about it. A very excellent drummer I jammed with once messaged saying his daughter is ill so can't make next practice, and doesn't want to be 'that guy' so is out of the band. That's fair, annoying, but much less annoying that doing that at random intervals for the next year.
Also, see the entire history of the blues for where music sits in relation to having life difficulty.