Letter of Persuasion to Bank

Has anyone heard of a letter of persuasion to the bank, while applying for a mortgage, to explain to the bank why you want to buy a house? A family member is required to write such a letter for each of the applicants. It sounds very odd to me. We have many mortgages for various family members and noone has ever been asked for anything like that. Any thoughts?

By ClintonHillGal |