Would you get mad if your dad doesn't invite you to his nrw family's Christmas photoshoot?

Just a little explanation, my dad got a new family and he lives with his new wife, her daughter from another man and now they got a baby together in a different city, about 2 hours away driving from where i live. So, basically me and that girl are step sisters to their new baby.

We are orthodox, so we celebrate Christmas on 7th of January, and of course they did a photoshoot in a studio of her daughter and our step brother and they didn't invite me. They even posted those pictures on Facebook,and I gave them a like because I don't want to look mean.

Btw I'm 17 and her daughter is a little younger than me.

Would you get mad? Is that fair or not?

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