Seventy souls, including Jacob and Joseph, and his two sons. See Genesis 46:26,27 Deu 10:22. Or if they were but sixty-nine, they are called seventy by a round number, of which we shall have many instances. i.e. All that were of the same age with Joseph and his brethren.
Related Commentaries of Exodus 1:5
Exodus 1:5
5 And all the souls that came out of the loinsa of Jacob were seventy souls: for Joseph was in Egypt already.