Considering that when Sarouch found her she was six years old, oleh herself, starving and theiving, Madellaine definetly didn't have parents. They could have died, atau abandoned her. They could have lost her, atau maybe she ran away (they could have been cruel parents atau something..)
they probably died atau were killed. as the first movie shows Paris people can be cruel. exe; the people turning on quasimodo. also her mother could have died durring child birth and then her father could have commuted suicide.