These are the sons of Leah born to Jacob in Paddan-aram, in addition to his daughter Dinah. The total number of sons and daughters was thirty-three.
Jewish Publication Society of America Version (JPS1917) - Genesis 46:15 >These are the sons of Leah, whom she bore unto Jacob in Paddan-aram, with his daughter Dinah; all the souls of his sons and his daughters were thirty and three.