Hi! My husband speaks czech exclusively to our toddlers (4&2). They are also exposed to the 2nd language via skyping with grandparents, movies and music. Both kids understand both czech and english but do not speak czech. They will repeat words but recall of the czech equivalent to an english word is not happening. We will try creating a need and motivating. We are also strongly considering moving to the czech republic to help. We will not stay permanently but want to understand what age the kids should be and what is the optimal amount of time we need to stay to build their vocabulary and confidence in speaking. We are also hoping doing so will allow me time to develop my language so czech can be our "home" language. Really appreciate the advice!