The man thought he was getting invited to sleeping alone with the woman. (How you wanna interpret that is up to you) Did not expect the ENTIRE family to be home, and also did not expect to have to sleep in the same room
I would assume that the family can't afford a house and live in a 1 bedroom apartment that's too expensive for one single person to live so they just stay together. Or it's part of their culture to have a big family in small home and sleep right next to each other.
well there all red heads so obviously Irish and since there are a shit ton sleeping on the floor i'm guess Irish Catholics (no birth control) it all makes perfect sense.
The family being present and sleeping like that