A.H.
I think that if he lives with you then your the boss and being a "mom" for him does not mean you are taking his mom's place. maybe what he needs is a MOM. someone who loves him and who will take care of him. someone who he can come to with anything. I'm guessing you are that type of person and his mom is not and you feel that he does not want you to be but I KNOW that's not true. teen years are hard but there easier if you have someone there to talk with. if you having problems it's probably his hormones. I think it's about time that you step up to the plate and be this boy's mom. if his real mom is'nt there much then he practacly does not have a mom unless you do it. he will push you away and he'll tell you he hates you but later when he grows up he'll know that you were the one always there and he'll love and respect you for it. Just be understanding with him and give him space.
another thing I disagree with the other response about sitting down all three of you. he might rebel thinking your ganging up on him. kids want friends instead of parents but they need parents instead of friends. talk with him seperatly if nessasary. spend more time with him so that he does not get mixed up in the wrong crowds at school. make a family night with you and another family night with dad then another one with everyone. that way he'll have his time occupied and he wont get into trubble. in fact i think if he does not have alot of chores ou should start that also maybe a date night for you and hubby and he can watch the baby. trust him because he needs responsibilty now. also if old enough encurage him to get a job because that will take up time too.