don't know what to do

My husband and I took in his little brother. His mom had to move to a small 3 bed 2 bath single wide(for a household of 4 adults plus his brother). So we took him in so he could have his own room since we had the room for him. He was always failing school and getting suspended at his moms house, so we thought if he was with us and had disinclin like he didn't over there that he would do better. Well I just had a baby and had been staying with my mom for the first two weeks of my sons life and my husband was going back and forth between my moms and our house. Well while we were gone apparently he has been getting into all sorts of trouble. His mom lives 3 houses down from us so he had supervision plus he's 14. He got iss, apparently he's failing a class, and to top it off he stole from his oldest brother, then he stole from us(my husbands original game boy he collects old gaming systems), then he stole $200 from his mom. Why did he steal all of these things from us? To buy pot. Before we knew that he had stolen from everyone and was smoking we let him spend the night at a friends, then he lied to his mom and said that my husband said he could spend the night all weekend at his friends house, apparently he was getting high all weekend with his friend. Then last night we asked if he had his clothes for school ready for the morning and he said yes. This morning when we were trying to leave for school he throws a fit because he doesn't have any clean clothes so he doesn't want to go to school. He blames it on his mom for not going to the laundromat, my husband gets mad and starts yelling at him because their mom didn't have the money for the laundromat because of him stealing money from her. Plus if he had told my husband we could have done his laundry at my moms while I was over there. He eats all the food in the house, doesn't help out, lies about having homework, steals, and apparently smokes pot. He got his tv, PlayStation, phone, Internet, and all freedom of going anywhere taken for 2 months. What should we do to help him we don't like the road he's going down.