How much rent has the BIL been paying you? If zero, that was the start of the problem...
I agree with some people above who cap visits at 3 or so days. Sadly my wife is from a culture where month-long visits are the norm -- it is not visiting, it is freaking going to live there... I just don't get it, especially when travel o/ from is only a single 9 hour airplane flight -- it's not like it is a two month journey each way. The past 3 years it has been my wife taking our young son to visit her parents; the first time it was for over a month. I kept requesting a shortening of the visits, as I miss a lot of time watching my son grow up. They just left this past week for a visit; it is down to three weeks now. But it is a one-way street -- no way do I want her mom visiting and staying at my house that long. We have to entertain her, alter our daily routine, etc., and then she complains she feels like a prisoner (she doesn't speak much English and we live in the suburbs, so she mainly sits on a computer reading news sites all day).
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