Well for one he is doing a lot less shows these days it seems.
But also, one of the major effects of alcoholism is a form of social isolation from those close to them, the alcoholic wants to be left alone more often and his/her loved ones will be happier and happier to do so as their temper becomes more volatile and unpredictable. One's family will feel like they are walking on eggshells around them all the time.
If true then his kids are probably feeling more and more anxious about interrupting dad, as he might be in one of his foul moods, better to bother mom or solve the issue themselves.