Teaching of oral and written French for my 8 year old daughter and 12 year old son.

My daughter (8) just newly joined the local school ( from an English school) in Crans. She is in 4p and needs assistance in written French as well as spoken French. She can get by in spoken French and needs help especially in grammar. We also have a son (12) who also needs tutoring for written and spoken French at a secondary level in an international school.