How do you write we love you granddaughter in french?

To say "We love you, granddaughter" in French, you would write: "Nous t'aimons, petite-fille." This phrase expresses affection directly to your granddaughter. If you want to emphasize the sentiment, you could also say, "Nous t'aimons beaucoup, petite-fille," which means "We love you very much, granddaughter."