Well that’s not always the case when it comes to my parents. Okay, my vocabulary might not be mature in some contexts. But that’s because Dutch is not my first native language and I started leaning it when I was 14. So I should learn many words by doing it my self instead of doing it at school. In that time my English was bad as well because I’m from China and English wasn’t popular in that country then. So no matter what I did, learning any of the languages (Dutch, English or Chinese) by enriching the vocabulary was very hard for me.