Question about relationship!

My wife and I are a lesbian couple and we have an 8.5 month old daughter together (private home insemination)

My wife has been in contact with some of her ex's family since we started talking. It hasnt bothered me much except that everyone wants her and her ex to be friends. And they all think I am being unreasonable for not being okay with it. I have sort of just let it be, aside from expressing how I feel about her and her ex continuing a friendship.

Christmas is coming and we are going to her ex's hometown because my wife has her own family there. Thing is, she wants to hang out with her ex's much younger sister because they are still close. Ive never had issues with this girl either!

So the other day I asked my wife what she wanted for Christmas and budgeted about $50-$80 on her. She said that was way too much and only spent $40 on me. I told her I dont care how much she spent, but okay.

Today she mentions she is taking her ex's little sister to get friendship tattoos for her christmas gift. That she is paying for half of (which will be at least $80).

Am I being unreasonable for getting jealous/upset. I just feel like sometimes she crosses the line. I never cause issues over this stuff but it eats me alive. And nobody seems to care how I feel. ESPECIALLY my wife.

Am I just being crazy !?

I really didnt care she only spent $40 on me but the way she said it was because she was too broke. And then can suddenly afford her own tattoo plus half of her Ex's little sisters'.