I am a little nervous that my 20 year old cousin will bring her flavor of the week to our wedding and her sister will bring her kids. My cousin and her sister are invited - the random guy and kids are not. They are so clueless there is a chance they will bring the them anyways, even if the invite is addressed to only them.
How should I handle this situation? have any of you faced anything similar??
(I would rather not invite either of them. but sadly this would create WW3 in my family.)