Adults sharing beds normal?

Okay, I was a little freaked by 2 scenarios and can’t get past it.
First time we visited his 50ish sister, she offered to share her king-size bed with my 3 elementary age kids. We (kids and me) were creeped out, but the fiancee didn’t see a problem, because she had her kids sharing her bed until they were in high school.
About 2 months later, several family members were meeting up in resort town, and we didn’t have a hotel reservation prior to arriving. I kept asking my fiancee before dinner, but we ended up ‘rooming’ with his 2 sisters in a room with a king bed and a sofa (not sofa sleeper). It was me, fiancee and that same sis in the bed, the other sis on the sofa. They thought it was fine, me (in my 40s) was uncomfortable all night. This was not a blizzard, hurricane or other unplanned event, and I definitely could afford one night’s lodging.
These people had a hard life, family ‘didn’t have a pot to pee in’, bless their hearts but I can’t believe they think I’m ‘high-faluting’ because of sharing beds while traveling, or having my kids sleep with strangers….
Am I so wrong? These scenarios have dogged me for over 10 years….