Who's the bigger issue here?

Story:

There's a rando family reunion after a baby being born premature. Everything is fine, that's not the issue.

An aunt has a big house near the hospital and her two adult nephews come to spend the night and see the baby the next day. They both bring their girlfriends, who live with them. The aunt is conservative Christian and doesn't want either couple sleeping in the same bed. Instead, she makes the women sleep in a bed and the boys sleep on her couches.

Couple #1 puts up with it and goes to bed. They understand that, while they think this is childish, it's not their house and go to bed without fighting it. If it matters to you, this couple has been together for a year and plans on being engaged soon. They aren't a problem

Couple #2 the woman gets upset she not only doesn't get to sleep with her bf, but she now has to sleep in bed with a bisexual woman she's just met. The bf doesn't want to fight. This couple has been together for 8 years, isnt married, but acts like they are. I'm telling you the status of the relationship because it changes some peoples mind.

Who's the bigger issue here? Couple #2 for fighting about the rules of the house, or the aunt for offering them to stay then enforcing her moral rules she doesn't share with either couple? Note that this place is rural, the few nearest hotels are full.

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Personally I think they're both wrong, the girl from couple 2 more than the aunt. To me, house rules are things like close the toilet lid. Not don't sleep in the same bed as the person you sleep with every night because I personally think it's wrong.

Would it matter to you if the relationship status was different? Like maybe if a couple was actually married or had been together even longer than 8 years?