I'm really concerned about my 16 years old son, Gus. It seems like ever since we and my 10 years old daughter moved in with my husband and his four children, my son totally changed.
Gus have always been an introvert and somewhat odd around new person for most part. I guess loner would be the words to describe him. But I couldn’t believe how bad things have been.

When we first move in, since my husband’s house have five bedrooms and there was 8 of us. My daughter who is 10 and step daughter who is 12 got along great and were fine with sharing the room.
Gus barely talks to any of stepchildren. So we tried to have him share the room with second oldest step son who is 15 since the oldest are twin and have their own room. On the very first night we moved in, Gus walk into the room and told him he isn’t going to share the room and to stay out of his way then he went into the garage and sleep in there.
A couple weeks later, Gus moved into the shed in the back yard and made it into his room. He seems much happier in there, but that still show where he stand when it come to the family.
Gus however does get along with my husband okay. If none of the kids are around, he’d talk with my husband. Also my husband always go to Gus if he need help with anything because Gus have talent when it comes to fixing things and never complain or give a hard time if asked for help. He always get up and help right away.

Other issue is Gus is a very responsible person. Ever since he starts to work at a scuba shop that his grandparent own, he haven’t asked for a penny. They also trust him to work there by himself if necessary. In fact he is so responsible that when his grandmother suffered from strokes back in September that made it impossible for her to make the trip to beach house, it was Gus who stepped up and took up the responsibility.
Gus has been gone pretty much almost every weekend. He’d get off work at 830 pm on Friday then go straight to the beach house and stay there until Sunday evening then come back home. There has been absolutely no incident at all.

So other kids are really jealous of him and, as much as I hate to say this, but they all are no where nearly as mature or responsible as Gus. My husband even openly told his twins this once. Also they bug me about it all of the time and I told them they’d have to talk to Gus's grandparent about it but none of them ever did.

Other thing that come up is, Gus have this two females friends who are 18 and 20 back in the summer. Since it is very rare for Gus to have a friend, I thought they’d disappear in a couple weeks. To my surprise they didn’t. They’re still friend to this day.
The boys are not happy about this, especially since my husband wouldn’t allow them to be around girls over 18 like that. They have been doing everything they could to try get us to stop letting Gus being around those girls. This has created some rift between my husband and I as well.

I don’t know what to do at this point. My husband and I are getting really worried about the whole situation. All kids aren’t happy about anything while Gus is really distant and avoiding the family.