Am I being over sensitive

I really want to know if I'm being over sensitive. I'm very protective of my kids. One of my kids has had a horrible year. He was in his dad's custody (because he just wanted to live with his dad and is plenty old enough to decide that) but some stuff happened with my ex's dad who I had no idea molested my ex when he was a kid. My ex never told me that. Something happened. I got emergency custody and then my ex died not too long after. He is in therapy. He's also on Zoloft right now.

He has moments where he sometimes regresses. He started having some accidents at night I wanna say back in September. It's not every night but enough to wear he started wearing something for it. He also has this squishmellow his therapist gave him and he was gifted another one Friday. So sometimes he just wants to be around someone and hug his squishmellow. We are dealing with everything the best way we can. He regresses a lot at night so one this he does at night is sit in a corner, he doesn't wear pants. Just a shirt and his protection and his squishmellow and draws. We are trying to use healthy coping skills because for a while he was cutting. He doesn't anymore and I check for cuts.

My sister came over Saturday unannounced. She brought my nieces and nephews. They're all adults. She's a half sister that I didn't grow up with so we are not super close. Honestly I think she thinks we are closer than we are because she shows up unannounced all the time. She was here because she's mad at her husband for whatever.

Following day my son asked me has he lost it. As in has he lost his mind. I asked why he was asking and it's because his cousins were talking about him close enough to where he could hear. He was in his corner doing his thing and I get that may be weird to see from a teenager but also don't talk about people in their own home. He said they were saying how isn't he too old to be wetting the bed and that the other one said he isn't all there. So he was asking me if he's gone crazy. Is he really not all their. Am I being over sensitive to be mad that they all showed up unannounced and judged my family loud enough for him to hear?