Formal:
* Mon père: This is the most common and formal way to say "my dad" in French.
Informal:
* Papa: This is a more casual way to say "dad" in French, similar to "Daddy" in English.
Other options:
* Père: This is simply "father" in French, but it can be used to refer to your father in certain contexts.
* Mon papa: This is a slightly more affectionate way to say "my dad" than "mon père".
The best way to say "my dad" in French depends on the specific situation and your relationship with your father.