Lot, the son of Abraham's younger brother Haran, was Abraham's nephew.
Genesis 11:27 "Now these are the generations of Terah: Terah begat Abram [who later had his name changed to Abraham - Genesis 17:5], Nahor, and Haran; and Haran begat Lot"
Genesis 12:5 "And Abram took Sarai his wife, and Lot his brother's son."
Additional nephews of Abraham are named in Genesis 22:21-24.
Answer 2:
If you are referring to Abraham of the Old Testament in The Bible who was the father of the Jews, his nephew's name was Lot.
Lot was Abrahams nephew and not son in law.
The bible says Lot Abrahams nephew had two daughters, and it is recorded in the bible that they made their father Lot drunk and then even had sex with him in a cave.
Abrahams challenges were that he had to protect his kids.
Abraham in the bible had two brothers, Nahor and Haran. His brother Haran was the father of Lot, whose wife was turned into salt.
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