I totally read this as it was the OPs brother getting married, so the groom's parents were the ones not returning from the trip, and STILL thought the sil was the unreasonable one.
With the further info I think that b!tch be crazy!
My parents were invited to DH's brothers wedding, see no issue and think its nice that my in laws see my family as important too.
However I think your SIL has gone a bit bridezilla! If she knew the dates then she shouldn't have booked the wedding if she wanted them to return in time. Fair enough if she didn't know the dates she might be disappointed but to expect them to return is way ott!
I really wouldn't see any issue in it if they were close generally. But for people she hardly sees, to invite them to two "gift giving occasions" and knowing that they would be away for one of them, it's a bit fishy.
Neither are being unreasonable. I would think it highly odd if your SIL arranged her wedding so your parents could attend (who after all are no relation to her). People would never get married if they arranged their wedding date around every potential guest.
At the same time I would not see why your parents would give a gift (particularly a generous one) to someone they hardly know for a wedding they are not attending!
Maybe a bowl from Turkey would be a good gift
Your sil is! If she knew their dates, why didn't she just book for the following week???
I think your SIL is being a brat. I wouldn't expect any of my IL's to invite my parents to their wedding and I certainly didn't invite theirs to mine. I am not even sure I would alter my holiday plans for a IL wedding
The gift grab thing came from information given by the op. It's not like it was just pulled out of the air. Clearly the sil doesn't have better things to do, as she's the one that's making it an issue!!
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