Genesis 44:27

And thy servant my father said unto us
When thus pressed to let Benjamin go with them: ye know that my wife bare me two [sons];
Rachel, by whom he had Joseph and Benjamin, and whom he calls his wife, she being his only lawful wife; Leah was imposed upon him, ( Genesis 29:20-30 ) ; and the other two were concubines, ( Genesis 30:4 Genesis 30:9 ) .