The loan mortgage is between your brother and the lender only. He cannot make you liable on the mortgage without your consent by signing a mortgage yourself with the lender. There is absolutely no reason for you to do so because as a co-owner on the deed you can pay if he fails to do so and, if you were a co-owner before he signed his mortgage, the lender cannot foreclose against you or your sister's interest in the real estate, which, as a practical matter, makes doing so of little value to the lender.
Answered on Nov 21st, 2012 at 9:26 AM