How will I know if my husband is already in need of alcohol rehabilitation?

My husband drinks alcohol everyday. Sometimes he gets drunk, sometimes he’s ok. What are the grounds for needing alcohol rehabilitation?

What are the signs that show that someone is already in need of alcohol rehabilitation?

I have a neighbor who always goes home drunk. I think his kids are getting really affected by this. His wife is abroad, so it’s just him and the kids at their house. I was just wondering whether he needs alcohol rehabilitation already as I feel sorry for the kids.