My youngest daughter was brought up in Portugal she was 16 months when we arrived there and she learned English in the house and Portuguese at the neighbors and was fluent in both by age 4 because she played with other kids (in the Local language ) she would also play in the house always in Portuguese and later when she was seven and I lived in Spain she was fluent in this language (more so than I ) within 6 months and could also transfer to French when we lived there so my experience suggests the more you expose your kids to languages and the earlier the better the easier it is for them to become multi-lingual
