Chloe
I'm so sorry you are dealing with this. These are the ways that addiction affects the whole family. It's so difficult to see it happen again and again here on SR.
And yes......what is happening is enabling him to continue his drug use. He doesn't have to do anything......he's being bailed out. He can use his DOC knowing (with a sense of relief) that his parents won't let his wife and children become "homeless". But the truth is, they don't have to let you become homeless and they don't have to enable him. And those things aren't mutually exclusive.
We don't have problems.......we have solutions we don't like.
I am so sorry you are dealing with this. It's very difficult and scary. There are solutions....but you may not be ready to accept them yet.
gentlest of hugs
ke