Am I overreacting

So hubs and I been married 8 years I had a son from a previous relationship and he has raised him since he was 2. Now we have a 10 month old and I’m pregnant with our biological 2nd. We are military and move a lot everywhere we have been someone in my family has visited, his has never came until last year when the youngest was born. Now his family is planning to visit soon and they post on social media can’t wait to see the baby! My mil is saying give kisses to my baby.. not once do the mention my oldest. They never do they never bring gifts to him but when the baby came they brought him clothes and toys. I feel like they are treating my oldest like he isn’t part of the family. We don’t go to our home town too often when we do there isn’t much problems they are nice to me and my oldest and we are civil but not close. I haven’t told my husband how I feel seeing as it can be my hormones taking the better of me. I just don’t want my oldest to feel like he’s not part of my husbands family he even thinks my hubs is his real dad he adopted him already also.