If your kids are that young it will be easier for them to learn the language which means that they will settle in easier. My mum, sister (14) and I (12) will be moving to France in september so I am manically learning french so as to be able to converse with classmates. The French schooling system is said to be one of the best in europe so I wouldn't worry about it too much. Keep a positive attitude and I'm sure you'll all be fine. Bonne Chance Jess