This is the second year in a row he's been asked my his mother to accompany her to India to sort out house/land/money that she has. He has siblings, but he's the eldest son, so is expected to go. It's also the 10th anniversary of his dad's death which is another reason for the trip. She has asked that we all go, but I'm not keen on taking our young dc to India, due to health reasons.
He knows the trip will eat into his annual leave (he gets 6 wks and is going for 2), which he would otherwise spend with us, but he's still seriously considering going. I have a very good relationship with mil, but I'm really pissed off that she's asked him again, and pissed off with him that he's considering going.
AIBU to not want him to go.