sister wife
n.— «Wives married to the same man call themselves “sister wives.” The multiple children created by these families call all of the women “mother.” That’s part of the reason Texas is DNA testing the children—because they’re still having a hard time sorting these families out.» —“What’s Up With The Prairie Dresses?” by Don Teague MSNBC Apr. 23, 20080. (source: Double-Tongued Dictionary)
Further reading
When Mandy of San Antonio, Texas, was living in South Korea, her Newfoundland friend would call and ask, What are you at? and follow with I’ll come where you’re to. The phrasing is a well-known bit of Newfoundland English that means something like...
Critters, co-workers, and clothes: What do you call your favorite mixed-breed dog? There are Heinz 57 mutts and Texas brown dogs in the U.S., while in parts of the Caribbean they’re called potcakes and coconut retrievers. Plus, among firefighters...