Oh No Donna, it sounds like he's a kid himself, and hasn't grown up. He doesn't seem to be very responsible, and chooses alcohol over the safety of his kids. Unfortunately there isn't much you can do to change him, but all you can do is be there for your daughter and grandchildren. You also can't get involved in your daughters relationship, because that never works, she has to know what she is willing to put up with in her relationship, and the less negative stuff we say the better, because experience has taught me that when you get involved and say things about the boyfriend, or spouse, you just push them closer together, and then when they make up, which they usually do, you're the one they're mad at. All you can do is be there for your daughter, listen to her, and wait to see if she finally has enough of his behaviour. But she does have to be the responsible parent and protect her children from his behaviour , it is not acceptable for him to leave 3 small kids by themselves, so he shouldn't be allowed to have them alone in his care, and your daughter has to make other arrangements for their care to make sure they're safe. I know how you feel, you worry about your grand kids, and you want to say something , but it's best to just support the kids and your daughter, and hope she tires of him, or sees him for what he is. Hopefully he will get help for his drinking problem, otherwise things will never change for your daughter, and she will have to decide if she wants to stay with him and his life.