Get rid of "que" = Pendant les vacances, à qui rends-tu visite?
Pendant les vacances, je rends visite à ma grand-mère.
the idiom is "rendre visite à"
Sra (aka Mme)
do you know why I shouldn't include the ¨¤? and why the que shouldn't be there?
Yes, you are correct! In French, when using the phrase "rendre visite" (to visit someone), you usually use the preposition "¨¤" after the verb. So your sentence "Pendant les vacances, je rends visite ¨¤ ma grand-m¨¨re" is grammatically correct. The preposition "¨¤" indicates the person or place being visited. Well done!