Would you feel some type of way

So the lady who raised my fiancé her and her daughter always post him ex girlfriend and his first baby mom on fb ans give them bday shot outs and invite his first baby mom places and take pictures with them and post them all on Facebook and tag her . But whenever I go places with them I ask them to take pictures or when they take pictures I never see them ever again. I’m starting to think they don’t care for me. The only one who reaches out to me is his real mom. It kind of make me feel some type of way but I think I’m overreacting