Depending upon your lease term, it is not necessarily 3 month. It can be two month or even one month. However, you should do what you have claimed. Otherwise, you will run into another kind of trouble.
yes, the reason i am saying 3 month is even if in the future that nuts wanna make truoble, you have another piece of evidence to prove that you are being nice to him. and that is true you and someone from your family have to move in. but after 3 or 6 month or max 1 yr you could rent it to somebody else.