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Your title's question is more general than the description. Just saying.
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Can you explain why you don't think it's Family Relationship Switcheroo? Said trope covers any example of a lie about a familial relationship (or lack thereof).
they/them || "Forgive me, regent of queer amphibians" - Lt.BGob
^^ Aren't most titles? it's better than leaving it untitled.
^ Isn't Family Relationship Switcheroo only for literal familial switches? Like, a woman gives up her child to her sister and the two raise the child under the belief that their biological mother is their aunt. The examples I'm thinking of involve a father passing himself as a family friend.
^That's covered by Luke, I Am Your Father, which includes the child's parentage being kept secret for various reasons, until their father/mother finally tells them the truth.
Edited by MiinU I wouldn't mind failure so much, if I didn't fail so much.
Do we have a trope for a kid growing up believing that their mother or father is an Honorary Aunt or uncle? It's not a Family Relationship Switcheroo.