Is your sister now paying quite a bit less at the new school than she did at BC? If your parents’ 2014 earnings are similar to their 2015 earnings, then the numbers won’t change much, but you are correct that having two students enrolled in undergrad schools (both meet full need) should result in some tution reduction unless your parents have a very high income and/or very high assets. There is a thread about how much BC uses home value in their financial aid calculations. Also, rental property or a business can impact financial aid a lot.