Xmas card Saga

[MiLou15]

AIBU?
Background is: I have a son from a previous relationship who is now 12 y/o. I married my husband a few years ago and we have recently welcomed a baby girl. The in laws have always been welcoming to my son and thoughtful when it comes to bday/xmas. This year (since my daughter has arrived) I’ve noticed a shift in the relationship. The MiL is very hands on with her other grandchildren but she won’t need to be with my daughter as my parents are helping me whilst I go back to work (which is fantastic!). We recently received Xmas cards. One addressed to my son and the other addressed to Mr & Mrs (our last name) with my husbands name, mine and our daughters. WTF it feels like they are excluding my son from our family. (Or she is as she wrote it!). Advice would be appreciated as I feel upset. My husband doesn’t think it’s an issue.

I think you are over thinking this. It would have been easier for them to do one card and include him - they have gone to the extra effort to get him a card and send directly to him so he has the pleasure of feeling special and opening it. Your daughter is too young for her own card.
I think they are trying to do the opposite of what you are suggesting.
Seriously they could have just sent one card!
I do something similar for my m'n'law who loves getting cards - I send cards from my kids individually and then from my husband and I.

He's 12 so presumably in high school or near to going to high school - they are starting to treat him as his own person its actually a positive thing and you are being over sensitive - probably because your parents are helping you and you are worried your inlaws are offended as to not be included maybe?

If it's Def MIL's handwriting I'd just message and say

"Hey MIL, we got the Christmas cards. Why did you send DS a separate one?"

Yes, I agree with PPs. I think this is an attempt at a thoughtful gesture which you’ve taken the wrong way.

Yeah, my grandparents used to send us individual cards when we were a bit older. They were ordinary cards, but they just liked us to have our own ones. I honestly don't think this is an issue.