To be valid, a mortgage must be signed by the

The vendee is the buyer in a transaction, typically involved in a purchase agreement rather than a mortgage. While the vendee may have an interest in the property, they are not responsible for signing the mortgage itself, as they are not the party borrowing against the property.

The vendor is the seller in a transaction and is not involved in the mortgage agreement unless they are also acting as the lender, which is not common. The vendor does not sign the mortgage because they are not the one securing the loan; therefore, their signature is irrelevant to the validity of the mortgage.

The mortgagee is the lender or financial institution providing the loan secured by the mortgage. While they play a crucial role in the mortgage process, it is not their signature that validates the mortgage; rather, it is the mortgagor's signature that confirms the borrower's agreement to the terms of the loan.