Invite in-laws of siblings to your wedding? My FI has siblings and his parents have put the siblings in-laws on their guest list. I wasn't sure if this was something that's common or not, so I didn't want to make a stink about it quite yet, haha. I have never met any of his siblings in-laws and FI has only met them once, at the weddings, so personally, we don't see it as necessary. Just wanted to hear from anyone else if these are people that normally make the guest list. Thanks.