The situation with Coltee and his mom is/was unacceptable. I think she was rightfully appalled at being dragged into the lair of a man-child and The One Who Never Leaves The House, Debbie. And there's nothing better than a heavy meal of piping hot stew on a 90 degree day in Vegas after a long flight, served in the family's second best Chinette.
I don't think she's an alcoholic, but I think she's a slug with no life of her own or ambition to do anything other than coddle Coltee.
Eric, on the other hand, has all appearances of being a semi-functional alcoholic.