To say "big sister" in French, you would say "grande sœur."
Frère is brother. Sœur is sister.
Oni-Chan
"demi-sœur"
une sœur
i have a big head
Bisoux A+
Sister in French is " soeur ", so with the appropriate article, one would add an 's' at the end.
"je suis une grande soeur"
We say: My soeur au long pied
Grand (masculine) or grande (feminine) eg l'homme grand (the big man) la dame grande (the big woman)
la grande sœur is the big sister in French.