Responses on my previous thread has gotten me curious. I've added a poll for anonymity.

If you were planning a birthday party for your LO, would it upset you if your MIL decides to throw one before yours? Assume that it would be the exact same people attending both events. In my previous post, I wrote that the person asking to throw it didn't know we were already planning a party - but now that my head is clear, I realized we've told her multiple times (but haven't sent out invites yet).