Nbber
Nbber (pronounced nub-er) is a term for a non-binary sibling.
"I would like to introduce you to my nbber, they are easily the coolest non-binary person I know."
"Where's your nbber?" Asked my mom. I responded saying "I think I saw them in their room, but I'll go check"
"Where's your nbber?" Asked my mom. I responded saying "I think I saw them in their room, but I'll go check"