Once back in the USA they just wanted to blend in , rather than be the ‘foreigners’ . When their teachers asked them to speak in French to the class , they declined , saying they had forgotten how . My eldest was considered retarded because in French ee means i , jay means g , etc. so when asked to write English words , my daughter who had created her own mental dictionary of English using the French phonetics came up with incorrect spellings . When told to write words on the chalkboard with the teacher dictating the letters , would place an I where an E should have been , G in place of J , etc. The school was actually going to demote her one grade until I took an afternoon off work to explain the spelling issue . Then they discovered she was actually near genius level in math , etc.
That is the daughter who became a flight nurse for a children’s hospital and is an outstanding nurse and administrator .
Later in life , my second daughter did use her French when assigned to work in Quebec .