Meaning that the family members will reduce their financial contribution if you get a lower than 3.5 GPA in college?
This subject has come up in the context of merit scholarships where a high GPA must be maintained to renew the scholarship up to four years. The usual consensus is that a 3.5 GPA renewal threshold can be stressful, since it is not easy to do in college. How much will they contribute if your college GPA falls below 3.5?