On March I passed the HSK level 4. It was pretty easy for me. I study Chinese to sit HSK level 5 exam. After this I will sit HSK Level 6 exam. I try to learn from 20 to 30 new characters a day.
We adopted them when they were older. They learned while growing up in China. I encouraged them to keep their language while they were learning English. That's great that you are learning different languages. My son is taking his third year of Spanish and is doing very well
Are they learning them selves? I learn Chinese mostly self study. I don't have teacher to guide me. I am an Indonesian. Thanks God this is a technology era where I can learn everything from internet and smartphone. It was hard to do self study when I was 16.