Isn't it BIL's money to spend as he wishes? What does his money have to do with your therapy? I'm missing something here I guess. Are you jealous you aren't invited on the alien encounter or something? Oh, you are saying your wife will spend money of her own/your own while on this trip beyond what her brother will pay for. (I'm slow and not awake yet. Sorry.) Why the tit for tat? Is it not okay for your wife to go off and have a bit of fun on her own without her "owing" you something?