Spanish is the second language in my family, ranging from native speakers to those who can get along if no one gets too fast or too fancy with vocabulary. I can speak Spanish, but I have the hardest damn time following spoken conversation. My niece and daughter understand Spanish but can't speak it. We noticed the same thing happening with my four year old granddaughter. Her father (native speaker) speaks to her in Spanish and she answers in English. They hired an au pair from Mexico City whose job includes talking to mi nieta in only in Spanish and insisting she answer in Spanish. Seems to be working. Plan is to put GD in an immersion course for a third language when she starts school.