(To preface we are Australian living in U.K. and all extended families are in Australia)
Dd is 21 at end of May. DM has had a five week trip to uk to celebrate Dd's 21st booked since October/ November time. She hasn't seen the kids in six years so it's extra special (in laws visit every 12-18 months). During that time we are spending 4 days in NYC as part of Dd's 21st bday celebrations and have given my DM the NYC trip as a gift . In laws have known of this and FiL has been communicating with my mum so knows all dates but has never even made a whisper to us nor my DM of wanting to be here this year. Received email today saying THEY want to come to uk mid to late may and aware of overlap of two days with my mum. Also suggested they get fucking round the world tickets and join us in NYC.
AIBU by being livid at the thoughtlessness displayed here. Dh is angry at me for being angry at his parents and doesn't see this entire suggested shitshow as selfishness on their part. if they come earlier and leave pre bday having had an early celebration with dd (her bday is mid exam period so nothing is happening on the actual date anyway). I have also suggested they leave me a couple of days to get the house in order for my mum and not steal her thunder by being here adorning my sofas.
Going to sleep on it and not send off any rash messages but will be messaging MIL in the morning.