Genesis 46:26

ESV All the persons belonging to Jacob who came into Egypt, who were his own descendants, not including Jacob’s sons’ wives, were sixty-six persons in all.
NIV All those who went to Egypt with Jacob--those who were his direct descendants, not counting his sons' wives--numbered sixty-six persons.
NASB All the people belonging to Jacob, who came to Egypt, his direct descendants, not including the wives of Jacob’s sons, were sixty-six persons in all,
CSB The total number of persons belonging to Jacob--his direct descendants, not including the wives of Jacob's sons--who came to Egypt: sixty-six.
NLT The total number of Jacob’s direct descendants who went with him to Egypt, not counting his sons’ wives, was sixty-six.
KJV All the souls that came with Jacob into Egypt, which came out of his loins, besides Jacob's sons' wives, all the souls were threescore and six;

What does Genesis 46:26 mean?

The middle part of this chapter (Genesis 46:8–15) has listed all of Jacob's official descendants by each of his four wives. This and the following verse total up those numbers.

According to this count, 66 total persons came with Jacob into Egypt. This number adds in Dinah, Jacob's daughter by Leah, who was left out of the count of Leah's offspring. It removes Er and Onan, who died in Canaan (Genesis 38:7, 9–10), and does not include Joseph or his two sons. The following verse will add back in Joseph, his two sons, and Jacob himself to the total count.

As stated clearly here, the count does not include the wives of Jacob's sons and grandsons. It is possible the count is meant to total up to 70 in the following verse, a number often representing a completed or finished group in the Old Testament (Exodus 24:9; Jeremiah 29:10; Daniel 9:24).
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