Abrahams two sons are found in the book of genesis.
Sarah
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.
All of Abraham's sons died after he did.
Sarah Lincoln died when she was 21 Sarah Lincoln died when she was 21
he had a sister named Sarah and a bro named Thomas
Isaacs mother was Sarah, that is Abrahams wife.
Sarah Lincoln died from giving birth to her first child at the age of 21.
Joe
A ram was cought in the bushes.
Abrahan and Keturah produced six sons as we are given. One of these sons was Median and it was of these tribe that those drew Joseph out of the pit his brothers had placed him in, sold Joseph to the Ishmalites, who were of Ishmael, Abrahams first son by Hagar the handmaid of Sarah.
because, before ishmael, that is who god said would have a baby.