When explaining to someone learning French when one has to use vous (the “formal
you” pronoun) or tu (the “informal you” pronoun), there is a basic rule of thumb I
find useful:
Vous — Used when speaking to people you usually call by their last
name, title, or occupation.for example: Ms Smith, Sir, Doctor, Officer…
Tu — Used when speaking to people you usually call by their first
name, nickname, or [? some word or phrase meaning informal/familiar family nickname
?].for example: Georges, G-dog, Grandpa…
I’m trying to find a word or short phrase to describe “family nicknames”
like Dad, Nana, etc., preferably one that doesn’t include the more formal
versions like Father, Grandmother, etc.
Best Answer
They are kinship terms (or kinship words).
This special class may overlap with what are known as terms of endearment: those words we use to address people for which we feel affection.