My husband’s aunt is too touch (in my opinion)

I don’t really know how to word it but... I find it strange but I try to be understanding at the same time. I know his aunt is important to him and all that, but to me it’s too weird when she always kisses my baby... because to me, he is family but not close family, if that makes since(??) I feel like a petty mom because the way it makes me feel.

Like of course I love my aunts too and I let them see him every once in a while but they are not overly attached like his aunt... am I too petty?!?!