DC has a party coming up. Due to where it is (not at home) there are very limited numbers.
The mum in question must be aware of this.
Party is for 2.5 hours. The child has told DC "I am coming but only for the last 45 mins"
So AIBU to think the mum should have talked to me and said X really wants to come but we have this prior commitment earlier in the day" and felt around the subject.
IMO this is just plain rude. Surely you accept an invite or you refuse it. You don't say only coming for the last bit.
This mum has done similar to DC before too!
How do I handle it given I will need to pay for this child at the party?