WR, The frat house style of living appears to be the norm for some of them. You have to remember, he's gone back in time and maybe this is his way of reliving his life back then. Also, they want to appear to be victims and have no money, but as they continue to "grow", things will change w/them.
Your inlaws are a bit unusual. I'd be very careful sharing anything w/them as they turned against you and because of a holiday, opt to start texting...it makes me think that guilt had a hand in that. Be careful what you share w/the sil...she may be fishing at times.
As for your h looking like crazy after surgery, well he may have looked a bit under the weather before hand and it carried over after surgery. He'll recover and look a bit better in a couple of weeks. He needs his rest and the tlc that he'll get from his sister. Don't worry...he'll be fine and right as rain again very soon.
Good luck today and I hope you can get things worked out at the lawyer's office. Hang in there!
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.