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Definitions by Kassy Kas

Big-little sibling 

A younger sibling who displays characteristics that the oldest should possess.
I'm the youngest of my siblings, but more mature. I'm a big-little sibling.
Big-little sibling by Kassy Kas September 10, 2022

Sugar Sibling 

An older sibling who spends money on their younger siblings without making them pay it back.
My sugar sibling just got a new job and makes eighty-grand a year. I'm going to be spending it like it's mine. They're my sugar sibling.
Sugar Sibling by Kassy Kas September 9, 2022