Please don't let your sibs ruin what efforts that you and H have made. Of course your sibs are feeling protective, but they should take your cues and go-with-the-flow.
What harm is it if they take the lead and engage your H in a conversation saying that while they don't approve of or understand his choices, they support your choice of working things out.
That may be uncomfortable initially, but could go a long way in helping your H face his demons too. I can only guess how much fear he has of their opinions of him. Remember a person's reputation means everything to them and he is certainly feeling that his is shot with your sibs and it hurts more than he lets on.
I hope things get better as the visit goes on. And if not, just hang in there for this too shall pass. Then it's back to DBing for you and your H!
Will send a prayer up for you!
totite
"Accentuate the positive, eliminate the negative..."