How do you say my favorite sister in French?

There are a couple of ways to say "my favorite sister" in French, depending on the nuance you want to convey:

Formal:

* Ma sœur préférée: This is the most direct and literal translation. It emphasizes your preference for one sister over the others.

Informal:

* Ma sœur chérie: This translates to "my darling sister" and conveys a strong affection for your sister. It's more about expressing your love for her than about comparing her to other siblings.

* Ma sœur adorée: This means "my adored sister" and carries similar sentiment to "chérie." It emphasizes your strong feelings for your sister.

You can also say:

* La sœur que j'aime le plus: This literally translates to "the sister I love the most." It emphasizes your love for her specifically, but may not imply a preference over other siblings.

The best choice will depend on the context and your relationship with your sister.