What is mother french?

"Mother French" is not a commonly used term in the English language. It's possible you're referring to one of these concepts:

* "Mother tongue": This refers to the first language a person learns, usually from their parents.

* "Standard French": This is the official, standardized form of the French language, used in formal contexts and as a reference for learning.

* "Old French": This is the language spoken in France before the 16th century, from which modern French evolved.

Could you please clarify what you meant by "Mother French" so I can help you better?