Third party's mortgage

There is a difference between third party's mortgage and ordinary mortgage because in the first case not debtor, but the third party, who is not debtor, has to pledge his property for debt of another person (debtor). About nature of third party's mortgage, there are some opinions and in my view, it's substance is combination of general mortgage and suretyships contract. In this paper, the effects of this contract will be considered from that view.