anon: boss, what about fictional sibling?
Okay, update…
F/R -> Fictional Relative
F/C -> Fictional Child
F/G -> Fictional Guardian/Caregiver (or) F/P -> Fictional Parent
F/S -> Fictional Sibling
There won’t be Fictional Brother/Sister, or Fictional Dad/Mom, please no not make gender-specific versions as it’ll make repeat acronyms and confusion.