According to Ruth 4:18-22, David is the tenth generation descendant from Judah, the fourth son of the patriarch Jacob (Israel). The genealogical line runs as follows: Judah → Pharez → Hezron → Ram → Amminadab → Nahshon → Salmon → Boaz (the husband of Ruth) → Obed → Jesse → David. This genealogy is only available from post-exilic biblical sources included in the later books of Chronicles and Ruth. Without these sources, all that would be know of David's ancestry was that he was the son of Jesse. The "tenth generation" formula is part of a larger pattern of tens within the Pentateuch/Deuteronomistic history: there are twenty generations of patriarchs (two sets of ten) from Adam to Abraham before David, and twenty kings of Judah after him, with the three Patriarchs Abraham-Isaac-Jacob between. The schematic character of the genealogy, and the fact that it runs from the Creation (Adam) to the destruction of Jerusalem, suggests that it was an exilic or post-exilic invention.

The New Testament traces the genealogy of Jesus back to David and Adam, with three blocks of fourteen "generations" each being similarly schematic. In the ancient world each letter of the alphabet had a numerical value, the value for the name "David" being fourteen: the fourteen "generations" thus underscored Christ's Davidic descent and his identity as the expected Messiah.

[edit] David's family

David was born in Bethlehem, in the territory of the Tribe of Judah. His father was named Jesse. His mother is not named in the Bible, but the Talmud identifies her as Nitzevet daughter of Adael. ^[40]. David had seven brothers and was the youngest of them all. He had eight wives: Michal, the second daughter of King Saul; Ahinoam the Jezreelite; Abigail the Carmelite, previously wife of the evil Nabal; Maachah, daughter of Talmai, king of Geshur; Haggith; Abital; Eglah; and Bathsheba, previously the wife of Uriah the Hittite.

The Book of Chronicles lists David's sons by various wives and concubines. In Hebron he had six sons (1 Chronicles 3:1-3): Amnon, by Ahinoam; Daniel, by Abigail; Absalom, by Maachah; Adonijah, by Haggith; Shephatiah, by Abital; and Ithream, by Eglah. By Bathsheba, his sons were: Shammua; Shobab; Nathan; and Solomon. His sons born in Jerusalem by other mothers included: Ibhar; Elishua; Eliphelet; Nogah; Nepheg; Japhia; Elishama; and Eliada. (2 Samuel 5:14-16) According to 2 Chronicles 11:18, Jerimoth, who is not mentioned in any of the genealogies, is mentioned as another of David's sons. According to 2 Samuel 9:11, David adopted Johnathan's son Mephibosheth as his own.

David also had at least one daughter, Tamar by Maachah, who was raped by Amnon,  Louis J. Sheehan, Esquire her half-brother. Her rape leads to Amnon's death. (2 Samuel 13:1-29) Absalom, Amnon's half-brother and Tamar's full-brother, http://louis0j0sheehan0esquire.blogspot.com  waits two years, then avenges his sister by sending his servants to kill Amnon at a feast to which he had invited all   Louis J. Sheehan, Esquire  the king's sons. (2 Samuel 13)