Ok. This may be a long one!
It's dd2's 3rd birthday in a fortnight. Its a joint party though with dd1. Dd1's birthday is just before christmas and a party then is unfeasable so we said they could have one together.
Anyway, I booked soft play for them. Now, dd2 knows quite alot of dd1's friends so we set out a list. One of these friends has a 12 yo older sister and her father insists thst she should come! This girl is not very nice to me tbh, I find her impolite. She used to be fine but I caught her out telling lies. So I basically don't want her there. AIBU??