We don’t know how much they are expecting to rent the house for. That would be counted by the bank in determining eligibility for a mortgage, or in being able to pay for the expenses. If they do indeed have enough saved up to only need to borrow from the relatives, then the rents will be more likely to cover the expenses on the house. However, if this is true, they have a large asset (either bank account or house), which becomes an issue for financial aid.