FI and I adore our grandparents. We've asked them each for one of their own wedding photos we can display at our wedding along with ones from our parents' weddings. We love the history behind them and where our families have led us to today.
Thing is- we are not close with any other family members. I have 8 aunts/ uncles with spouses and 12 cousins and not a single one of them are invited because frankly I did not grow up with them and I don't know or care about them. We were forced to get together once a year for Christmas and that was all I've ever seen them. FI was close with a handful of aunts but they've all passed and he has a handful left who have lived across the country for his entire life so he doesn't really know them. He has one local aunt invited (only because FMIL badgered us to death). So in summary we have parents, grandparents, and one aunt invited to our wedding and the rest are entirely friends.
Is that weird to have the family photos displayed when no one else there is family? It will only be 5 frames on the guest book table, so not some huge massive show piece. But I don't want my grandparents to feel strange- like "why did you need our picture when no one here even knows us and you didn't even invite my other children"? I dunno, is that weird? I really like the pictures lol