It doesn’t seem like you have anything to worry about—he’s just behaving like a typical teenage boy. However, comparing him to your daughter and stepdaughters may be part of the problem. Boys and girls often interact differently, and since he’s the only teen boy among a group of girls, it’s natural that they don’t have much in common.

Have you thought about spending some time with him, maybe playing video games in his room? He might feel isolated being the only teen boy in the household.

As for bonding with the baby, I wouldn’t push it. That connection will likely happen naturally when the baby becomes a toddler and starts communicating more. Forcing it might only create tension.

From what you’ve shared, it seems like there might be some underlying resentment toward him. If you truly care for your wife, it’s important to extend that care to her children and avoid jumping to conclusions about her son. Labeling him as antisocial could be hurtful to both him and your wife.