Introducing the concept

Accidentally introduced the concept of polyamory to my parents the other day, when discussing friends with my mum over the phone.

Mum: So who was there?
Me: Me, Topper, C and A.
[Pause]
Mum: Is A C's partner?
Me: Erm... yes.
Mum: I thought his name was J.
Me: Well, J is C's husband and A is her boyfriend. They both know about the other and all get on really well though.
[Pause]
Mum: Oh... that's weird.
[Pause]
Mum: Don't you think that's weird?
Me: I did at first, but not any more because I've seen it works really well for them.
Mum: That's weird.