What would you do in this situation?

Sil invites me to baby shower a few months back..

We live in fl theyre in tn we tell them yes we'll be there then we'll come up after baby is born at the end of August to see her.

All was fine..until she realizes I don't get along with a family member going to shower ( i would be respectful im not an idiot)

So she univites me..fine. I understand. Im still sending her money on the day of shower so she can pick up anything she doesn't get...so anyways, my sons birthday is next friday. She informs me she wont be sending a card or anything (not even 5 bucks) because she has a baby consignment show to go to plus the family member i dont get along withs childs birthday is next week as well..she straight told me im buying said family members child something so your son wont get anything. Do i have a right to be mad? Still going to send money for her shower because her unborn child didn't do anything wrong but should i do anymore after that? It costs money to get to tn..so now im second guessing my trip up to see the baby...

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