So some background info: I am very close with my immediate and extended family, both my mother and grandmother have been the "glue" for their generations. I don't have any aunts or cousins, just one uncle. My moms cousins and their kids are who I called my aunts, uncles and cousins growing up.
One of my aunts is re-married and I have only met her new husband twice and his kids from his previous marriage once (at my cousins funeral). I obviously invited my aunt and her hubby to my wedding, but did not invite his children. When she RSVP'd on my website she added his sons name. I told my mom out of frustration because I did not know how to handle the situation. We decided to just leave it and avoid the family drama. THEN, she invites my uncles new girlfriend to my bridal shower without asking and I had only met her briefly once before. A bit of a touchy subject because his previous wife was my favourite aunt growing up. It would not have been a big deal if it was a backyard shower or at someone's house, but it was at a sit-down restaurant where my mother had to pay per person. But now she has invited multiple people to my different wedding events without asking first, and when her son got married, none of our side of the family was even invited!
I am not one for confrontation and have decided to just let it go (since my great aunt has already yelled at my aunt for this.)....but I am still a little rattled about it all.