Hi,
my dd1 is 8 and speaks English and French both very well, although we moved to France when she was 4 so her schooling has all been through French and her French is probably stronger than her English at this stage, well 'written' anyway. She does favour English at home when playing with her siblings though, so I would say her spoken lang is about equal.
She's beginning to let French interfere more and more though. She says 'at the place of' instead of 'instead' (au lieu de). She says 'we are 10 in our class' instead of 'there are 10...' (nous sommes) and so on. Of course her brother and sister hear these expressions and pick them up so they've become normal expressions now and are grating on my ear!!!
What should I do? If I correct them they take the correction but get it wrong the next time. Is it normal that even truely bilingual people say things in a 'funny' way sometimes?
BTw they have very little daily contact with English apart from with me, so is it always going to be a struggle?