My mom and dad got invited to a relative's wedding. It's their cousin's kid I think? Some sort of distant but still friendly relation like that. Anyway my mother told me this morning that the invite was for "all of us"- mom, dad, my brother, myself and my husband. I asked about who was named on the invite, and she said only her and dad were- but that her cousin, the mother, was paying for the wedding and had told my mom it was an invite for everyone. I asked if the bride knew her mom was inviting more people and she just laughed it off.
I don't know these people well and the wedding is down in Florida (we live in CT), so I doubt I'd go anyway. But having thrown a wedding just a short almost year ago, I can't believe the bride will be happy with her mother throwing out invites without her possibly knowing.