My best friend group consists of a guy I dated, a girl he was engaged to, her husband, my husband and various siblings of ours. I don't really think it's weird at all. If they were flirty / inappropriate I could see having an issue, but clearly they were important enough to each other and each others families to stay in contact even when it stopped being romantic.
House guests don't sleep in the same bed as you ….
My best friend group consists of a guy I dated, a girl he was engaged to, her husband, my husband and various siblings of ours. I don't really think it's weird at all. If they were flirty / inappropriate I could see having an issue, but clearly they were important enough to each other and each others families to stay in contact even when it stopped being romantic.