Abraham was born five centuries before the Torah was given. At that time, there was no formal process of conversion. The determining factor was one's rejection of idolatry and acceptance of behavior that would be pleasing in God's eyes. This kind of behavior was taught by elders such as Shem and Abraham.
Abraham's wives either adopted the same forms of behavior whi ch he did before meeting him, or learned from him.
Abraham's second wife was Keturah, who bore him six more sons, one of who fostered the medianite tribes, these are the ones who lifted Joseph from the pit, selling him to the the Ishmalites(descendants of Abrahams first son by Sarah's handmaid), who then sold Joseph into Egypt.
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It could be his wives who were not Jewish.
Abrahams challenges were that he had to protect his kids.
Doris Abrahams died in 2009.
Rehane Abrahams was born in 1970.
Doris Abrahams was born in 1921.
Sidney Abrahams died in 1957.
Sidney Abrahams was born in 1885.
Israel Abrahams died in 1925.
Israel Abrahams was born in 1858.
Bennie Abrahams died in 1990.