Catholics vs church of Christ and infant baptism

My in laws are church of Christ and do not believe in infant baptism. 
We are going through the process of officially being catholic and are having our 2 children baptized in the Catholic Church. We invited my inlaws and they said no. They do not believe in it.
I'm upset because I'd like them to witness our children getting baptized, but feel like I can't say anything.
My siblings are methodist and are going to be attending... even my agnostic siblings are attending to celebrate something huge to us. Am I allowed to be irritated with my inlaws?

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