[lunaticlabs]

I was fluent in 3 languages before school, as is my little brother. Parents from 2 different countries, and moved to America when I was a young child and my brother was born in the USA. It helps if the parents can communicate to each other in their native tongues (like my parents). Of all the 2+ language families I knew growing up, the children generally only learned their parents' native language if both parents either had the same native language, or if both parents were able to speak both native languages. Also thoroughly anecdotal.