I like the way that you advised your h of the normal things w/the business and then introduced the subject of the uncomfortable position that you are in. After all, he needs to be aware of what is going on w/the business you both own. The BIL is taking advantage of the fact that your h is not on site and is doing things that would normally have someone fired over. Besides, you are put into the position of watching and hearing about this stuff and probably can't do anything about it w/the BIL. A very uncomfortable position to be in and I'm sure it can be stressful at times too.
Your h needs time to digest what you've posted to him...he will respond back to you in a bit.
I'm sure you are counting down the days to go to NYC. I do hope that you enjoy yourself and can recharge your battery while you are 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.