Just gained temporary guardianship of my 15 year old brother in law.

I would prefer not to go into the specifics so I am going to be a little brief. My husband is the oldest of six. They do not all have the same fathers. My husband is 24 and he has a brother who is 20, but the other four siblings are minors (ages 6, 8, 11, and 15). My mother in law is in jail. I would prefer not to say why but I will say that it was not for child abuse or anything like that. The youngest three of my husbands siblings all got sent to their dads house, but the 15 year old has a different father from the rest who was deemed unfit to take him in (no house, no job or income, no car, etc.). So my husband and I now have custody of the 15 year old until their mother is out of jail.My head is reeling a bit. The brother has stayed at our house several times before and we have the usual rules of like clean up after yourself, don't stay up all night, do your homework, etc. We honestly probably have more rules and supervision than what he had at his mothers house. But now he is living here and that is obviously vastly different from just spending the week here. My husband is very good with all of his siblings as he essentially raised a lot of his siblings when he was younger and still living in the house. But I don't even know where to start. I feel like we need to sit down and have a discussion and set some ground rules and whatnot. The brother will be at our house alone for about 2-3 hours after he gets out of school while my husband and I are still at work. Basically, I just need some guidance here. via /r/Parenting http://ift.tt/2hUeLoF