I think Het's parents are very typical of Indian parents and families I've met outside of Britain.
They prize education and obedience. The things considered normal behaviour for most children here are considered "naughty" by traditional Asians.
As for Het's mother wanting her to be an astronaut, it's very normal for Asian parents to have high hopes for their kids from a very young age.
Joke:
Asian granny to another Asian granny, "How old are your grandchildren?" Answer: "The doctor is five and the lawyer is six"
Because Het's parents are first generation immigrants, they will tend to bring a lot more immigrant baggage with them, including a very strong will to success and getting their children to succeed. After all when you start a new life in a new country, there is no safety net if you fail.