We are considering a move to the French speaking part of Switzerland. We are British, DC only speak English as do we (other than rusty school French).
We don't know how long we'll be there but say we had 5 years there (DC would be 5 and 2.5 when we arrive) I'm guessing they'd be pretty fluent in French (they'll go to local schools), but would lose a lot/all of it if we then move back to the UK, or do languages lie dormant in the brain and can be reactivated with less effort than starting from scratch?
Obviously it's all hypothetical but it would be nice to keep it up so perhaps a French speaking au pair and some lessons would help.
Just would be a shame to go through the pain process of learning it just to lose it again......