Answer:
just write a letter to your parents requesting money but remember that you are a kid from a boarding.
Explanation:
explain why you need the money and always use simple language because you are writing a letter to your parents. you wouldn't like it if your kid wrote you a letter like this will you? " dear mom and dad I hereby want to request you for some fine" so use simple words/ informal words. And because you are writing a letter to your parents put mom and dad since Cambridge only accepts if you write mom and dad without any other form to call your parents.
Hope this helped!