Ugh, indeed. That particular can of worms will need to be opened. Having Dad unable to be woken up is not a great situation when he is looking after the children. Of course, you can only control you.
Open the can of worms and peak inside. No need to have them spill out all over your new home. Just a look. No violently shake the can - then all you got is wiggling worms everywhere to clean up. Metaphorical speaking.
Gently inquire as to what the kids were doing/playing. How often and how they tried to wake Dad.
Perhaps the kids require there own cell phone to be able to call you, and for you to call them. I know, how wild is that? Your kids will have a cell phone because you know they will answer. When one’s children are more responsible than their parent, it displays just how much a hold the crisis has on our (ex)spouse. Depression and addiction are powerful.
The kids are fine. And you will figure out what to do going forward.
Congratulations on getting moved, and tossing out two rooms of superfluous stuff. It is neat, how cleaning the physical world allows one to clean their emotional world as well.
D
Feelings are fleeting. Be better, not bitter. Love the person, forgive the sin.