I don't have much to add to this, as my kids are 3, 2, and 15 weeks gestating...

I do have experience in drugs & alcohol though. Sober 10 years, here. Most of my highschool friends I partied with we're just partying. I don't think having BIL is going to hurt anythIng. And since your H seems to think its your responsibility to handle, handle it how you see fit.

Maybe you'll get a double grunt...

M: 9 yrs
T: 13 yrs
H:34 Me:35, S4, D2, S 7 months
Dday 11/12-PA & multiple PAs
Dbing 12/12
S 1/13
7/13 H moved back in basement.
8/13 #3 born
10/13 still cheating
10/13 He moves across country, I file for D