That's interesting lovemyDD. The only family I have know who have tried raising their kids bilingual - but using their non english langauge at home as you do - were very successful from what I understand. Both children went through a phase between 10 months and 2yrs where they tended to muddle the two languages together, but from my understanding they did separate them by 2-2.5 yrs, figured out when to use which, and became pretty fluent in both. Though I haven't seen them since the youngest was 2, the family has since moved countries and reversed their language use, so now they are working on keeping their kids' English.... I think their girl was an earlier/more fluent speaker in both languages.