"Las niñas visitan a su abuela."
Translation:The girls visit their grandmother.
Shouldnt this say "las niñas visitan a sus abuela" since niñas is plural?
Su needs to stay singular, since there is only one abuela.
I don't understand why it's not "sus abuela" since there's more than one niña. I said "your grandmother" and duo let me get away with that.