PIL have asked if they can take DS and his cousin to US to see other family members. We have said yes, lovely, thank you but not during school time. We have given them the dates for half term and Easter hols next year. FIL keeps texting me with flight dates during term time. DD has never missed any school days for holidays, he's now in year 6. At a push DH and I have agreed he could miss two days either side of a school holiday if this helped with flight bookings. DH sister is happy for her child (cousin) to miss school (also year 6). I feel we look like the baddies. DD does not know a trip is on the cards. AWBU to insist upon travel during (predominantly) the school holidays?