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Friends, roommates, or neighbors who are as close as family and fill the function a proper family should, complete with uncondictional love (and frequent bickering). A boon for those with less than happy real families. Similar to the Japanese Nakama; see Brother From Another Mother for a specific relationship.
"...and this is my sister Megan."
"Dude, aren't you an only child?"
"We're unbiological family."
by Moonlit Silver September 16, 2008

Words related to Unbiological Family

brother from another mother nakama brother dad family love mom sister