The Davy Family is an old bloodline whose members all seem to carry the Will of D., tracing their lineage to the folkloric pirate Davy D. Jones. Hounded by the World Government for roughly eight centuries, they survived in the Underworld and sheltered on God Valley. Marshall D. Teach is the only confirmed survivor.
This clan claims descent from Davy D. Jones, the legendary buccaneer remembered for inspiring the Davy Back Fight. Their bloodline has existed since at least the Void Century, and across eight hundred years the World Government treated them as a threat worth eradicating. Every known member appears to bear the Will of D., a trait that made the family especially dangerous in the eyes of the World Nobles. Persecution drove most of them into hiding, scraping by through the Underworld and eventually taking refuge on God Valley, a nation in the West Blue that held no ties to the World Government.
Because of who they descend from, the family carried a political weight far beyond their numbers. Thirty-eight years ago they were flagged as prime quarry for the Native Hunting Competition staged on God Valley, listed right alongside Bartholomew Kuma, the last of the buccaneers. Their gathering on the island was discovered by the Knight of God Figarland Garling, who then proposed God Valley as the venue for the hunt. That decision drew in the Rocks Pirates and set the stage for the catastrophe later remembered as the God Valley Incident.
The pirate Davy D. Xebec, far better known as Rocks D. Xebec, admired his ancestor and kept his true surname hidden to avoid the suffering his kin endured. He had sent his wife and infant son to live under the family's protection on God Valley. During the incident, members of the clan were somehow turned into demons and used against him, forcing Rocks to cut them down to shield his family before he too was transformed and ultimately slain by Garling. His son, Marshall D. Teach, stands as the lone known survivor of that day, his heritage understood by only a handful of figures including the Five Elders and his own Ten Titanic Captains.

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The Davy Family is an old bloodline descended from the legendary pirate Davy D. Jones, with every known member carrying the Will of D. The World Government hunted them for roughly eight hundred years, forcing survivors into hiding through the Underworld and eventually on God Valley.
Rocks D. Xebec, better known as the pirate Rocks D. Xebec, descended from Davy D. Jones and kept his true surname hidden. His son, Marshall D. Teach, later became known as Blackbeard and is the only confirmed survivor of the Davy Family.
No, the Davy Family's only confirmed survivor is Marshall D. Teach, also known as Blackbeard. Luffy is not established as a member of this bloodline.
Every known member of the Davy Family appeared to carry the Will of D., a trait the World Nobles viewed as especially dangerous. That persecution drove most of the clan into hiding through the Underworld before they took refuge on God Valley.
Members of the Davy Family were somehow turned into demons and used as weapons against Rocks D. Xebec, forcing him to cut them down to protect his own family. Rocks was then transformed and killed by the Knight of God Figarland Garling in the same catastrophe.
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