"Jacob is said to have had twelve sons by four women, his wives, Leah and Rachel, and his concubines, Bilhah and Zilpah, who were, in order of their birth, Reuben, Simeon, Levi, Judah, Dan, Naphtali, Gad, Asher, Issachar, Zebulun, Joseph, and Benjamin, all of whom became the heads of their own family groups, later known as the Twelve Tribes of Israel, and it is also known that he had a daughter, Dinah. It is possible he had more children than the thirteen named in the Bible, as the passages Gen. 37:35 and Gen. 46:7 both mention the existence of his sons and daughters, which could support the existence of additional children, who were unnamed in religious texts. Jacob displayed favoritism among his wives and children, preferring Rachel and her sons, Joseph and Benjamin, causing tension within the family, culminating in the sale of Joseph by his brothers into slavery." - (en.wikipedia.org 30.01.2020)
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