Now that we are all history, I think I should add some more.
Abraham AS had two wives, Sara RA and Hajra RA. ( they are quoted in jewish and christian texts as well as muslim).
Sara was from Royal family, Hajra was slave woman.
Sara gave birth to Issac AS and Hajra to Ismael AS.
Issac stayed in Abraham's land, Ismael was brought down to Mecca to start build Kaaba.
All prophets hence forth came from Issac's blood line EXCEPT Mohammad pbuh.
Wrong. Only Sarah (Sarai) was Abraham's wife. Hagar (Hajra) was Sarah's Egyptian slave girl. When Sarah was not able to bear a child to Abraham, she sent Hagar as surrogate, to bear a child. Ishmael (Ismail) was thus born from Abraham and Hagar. The Hagar started to mistreat her mistress Sarah. So, God felt pity on Sarah and removed her bareness and she bore a son named Isaac whose son was Jacob (Yaqub).
Here is the family tree of Abraham.
Terah: from Ur of the Chaldeans; has three sons; wife not named (11:26-32; cf. Luke 3:34).
Haran: dies in Ur before his father dies; wife not named; son Lot, daughters Milcah & Iscah (11:27-28).
Nahor: marries Milcah, daughter of his brother Haran (11:29); have eight sons, incl. Bethuel (22:20-24).
Abram: main character of Gen 12–25; recipient of God's promises; name changed to ABRAHAM (17:5); sons Ishmael (by Hagar) and Isaac (by Sarah); after Sarah's death, takes another wife, Keturah, who has six sons (25:1-4), including Midian, ancestor of the Midianites (37:28-36).
Lot: son of Haran, thus nephew of Abram, who takes care of him (11:27–14:16; 18:17–19:29); wife and two daughters never named; widowed daughters sleep with their father and bear sons, who become ancestors of the Moabites and Ammonites (19:30-38).
Sarai: Abram's wife, thus Terah's daughter-in-law (11:29-31); Abram also calls her his "sister," which seems deceptive in one story (12:10-20); but in another story Abram insists she really is his half-sister (his father's daughter by another wife; 20:1-18); originally childless, but in old age has a son, Isaac (16:1–21:7); name changed to SARAH (17:15); dies and is buried in Hebron (23:1-20).
Hagar: Sarah's Egyptian slave-girl; mother of Abram's first son, Ishmael; much conflict with Sarah after his birth; even more after the birth of Sarah's son, Isaac (16:1–21:21).
Ishmael: first-born son of Abraham, by Hagar (16:1–17:27); wife or wives never named, but has 12 sons (25:12-16), the ancestors of 12 tribes of Ishmaelites (37:25-28). - see below
Isaac: second son of Abraham, by wife Sarah, despite her old age (17:15-21; 21:1–35:29); marries Rebekah, who has twin sons, Esau & Jacob.
Betheul: youngest son of Nahor & Milcah; wife unnamed; father of Rebekah (22:23) and Laban (24:29).
Rebekah: daughter of Bethuel (22:23); becomes wife of Isaac (24:15–25:20); favors their younger son.
Laban: son of Bethuel, brother of Rebekah; has extensive interactions with Jacob (24:29–31:55).
Esau: elder twin son of Isaac & Rebekah (25:25); names of wives differ in two traditions (26:34 & 28:9 vs. 36:2-3); one is a daughter of Ishmael; his sons are ancestors of the Edomites (36:1-43).
Jacob: younger twin son of Isaac & Rebekah (25:26); conflicts with Esau (25:27–27:46); marries Leah and Rachel, daughters of his uncle Laban (27:43–29:30); name changed to ISRAEL (32:28); has 12 sons (with two wives + two slave-girls), ancestors of the Israelites or "12 Tribes of Israel" (29:31–49:33). -