Even if FIL is cool, since BIL is a problem then I would take away everyone's keys and if you MUST give someone a spare key, only give it to a trusted friend who doesn't have such horrible boundary issues.
Anonymous
05/28/2015 10:25
Subject: Question - in laws
Lock the front door.
Anonymous
05/26/2015 14:53
Subject: Question - in laws
and do they live locally or did they arrive from a lengthy road trip?