My parent’s expected amount of money paid for my study expense is not too big, ofc because my parents dont earn much. So Im really afraid that money is not enough to cover extra expense like flight ticket (yeh Im international student) so should I enter the money my relatives can help? They are rich but I’m not sure whether they can help us or not 
Just hoping put them into would secure that I could come back to my country.
I’d just answer the questions as asked. It will depend on whether the colleges meets the needs of an international student if you get a lot or not enough to cover your costs. I suspect those wealthy relatives will get plenty of opportunities to help you. Most schools cannot give international students enough to pay all tuition, living and travel expenses.
thank you twoinanddone