Where is the evidence of
barely have a grasp on your native language like so many kids these days? They seem to have a pretty good grasp on it, IMO, the ones I know, anyway.
My children learned Italian in the late 70's because we lived in a Canberra suburb where a large number of Italians had settled. It was a great school and created a great atmosphere. Almost like a culture exchange as it was not confined to language only. It made the English learning easier for the children whose native language was Italian.