Matthew Poole and continuators on Genesis 46:15

15 These be the sons of Leah which she bare unto Jacob in Padan-Aram with his daughter Dinah; all the souls of his sons and his daughters , were thirty and three.

This is true properly and immediately of the sons, who were indeed born there, but improperly and mediately of the Grandchildren, which are as truly said to be born of Leah in Padan, as to be born of her at all, because they were indeed born of them which were born of her and that in Padan.

To wit, which came into Egypt as before; so that Er and Onan are excluded, as dying before this journey into Egypt, ver. 12. Daughters is here put for daughter, as ver. 7. because Dinah was all the Daughters which Iacob had. Heb. all the souls, sons and daughters, being reckoned together with their father.