What gets me through the most difficult evenings as I wait for our divorce to count down the calendar is our son. Since he was 4 weeks old, I've been the only one with enough patience to put him to sleep and so it's been our nightly ritual for me to take him upstairs and to rock with him for as long as it takes for his eyes to get sleepy and to lay him in his crib.
Every night, I tell him that daddy loves him and that I'll be there for him in the morning. Every night, I look at him and promise him that I will do everything I can to protect him from harm. And then I'll sing a little bit of "hush little baby" and he throws back a huge grin, plops his head down, and closes his eyes, and I know that I'm doing the right thing.
You have 4 children that you need to ensure are safe and happy. Keep that close to your heart, and don't ever forget how important that is, because an active alcoholic is not going to remember for you.