Wow River21 what a lot you and your family have had to contend with.
How could you have known about the drug usage. It’s not your world so you wouldn’t be looking out for the signs. He was clever at hiding it, until he could no longer keep up the facade.
His homelessness rests on his shoulders, and naturally you’ll have concerns because you’re a caring person. You sound a very strong and resilient person, and from what you have said you are making sure you and your family are safe.
I hope you get to start your new life soon as a family in a place you feel happy and safe in.