When Figaro says that he himself is of noble birth and that he was stolen from his parents when he was a baby , it then turns out that Figaro is the long-lost illegitimate son of Bartolo and Marcellina . . Figaro argues that he can not get married without his parents ' permission , and that he does not know who his parents are , because he was stolen from them when he was a baby . The ensuing discussion reveals that Figaro is the long-lost illegitimate son Rafaello of Bartolo and Marcellina .