If you are looking at $40,000 a year at GT, and have $20,000 saved, and you borrowed $140,000 (you can only borrow $27,000, so parents would have to take out the other loans) over 4 years, at 8% interest. That would be about $1,700 a month payment for 10 years. Most likely more because each year’s loan would accumulate interest while adding next year’s loan.
$1700 times 120 payments is over $200,000 !!!
If you earn maybe $60,000 at your first job, after taxes you might have $4,000 a month for rent, food, utilities, car, etc.
Do you really want to pay almost half of your net salary on student debt?
And you said your sister is starting college soon after you. If your parents are borrowing $35,000 a year for you, will they be able to help pay anything for her school?