My dad battled alcoholism behind closed doors for many years, to the outside world he was a well respected family man with a very responsible job, but we knew different. He could drink until 4 in the morning and be in work at 8am bright eyed and bushy tailed, you'd never think he'd even had a drink the night before.
He was never violent or anything towards us but we all knew his drink came first and we came second which is tough for a child to come to terms with. It wasn't until he had grandchildren that he finally made a commitment to getting sober, he'd tried AA on and off over the years but this time he went to a facility and hasn't touched a drop since.
I really feel for Liz's kids, its not easy and you actually begin to think it's normal to drink every night, we all moved out at quite a young age and it's only over the last few years we're developing a proper relationship with him