dh is french, and we speak french at home. i'm english but have always spoken a mix to ds (2yrs), just whichever language came naturally. he's speaking both languages, though english is stronger of the 2, but we've come back from 2 weeks in france and he's mixing up languages (eg i put it in my bouche - cute but confused!). should i be sticking to my mother tongue or is it ok to speak both?