Question: What did Edwin Brockholst Livingston's brother Philip sign?

Context paragraphs:
Henry Brockholst Livingston: Henry Brockholst Livingston (November 25, 1757 – March 18, 1823) was an American Revolutionary War officer, a justice of the New York Court of Appeals and eventually an Associate Justice of the Supreme Court of the United States.

Liberty Hall (New Jersey): The Liberty Hall Museum in Union, Union County, New Jersey, United States, is an American historic site.  Built in 1772 as a fourteen-room Georgian-style house, Liberty Hall stands today a fifty-room Victorian Italianate mansion.  Liberty Hall has been home to many historical figures and was the home of William Livingston, the first Governor of New Jersey, who served from 1776 to 1790; United States Supreme Court Justice Henry Brockholst Livingston; the Kean political dynasty, including Susan Livingston Kean, widow of Continental Congress delegate John Kean, United States Senator and Congressman John Kean, and Captain John Kean, son of United States Senator Hamilton Fish Kean; and, in its first year of occupancy, future Treasury Secretary Alexander Hamilton.  Liberty Hall has had visitors of such stature as George Washington, Martha Washington, Lewis Morris, Marquis de Lafayette, Elias Boudinot, and John Jay, the latter of whom was married there.

Albrecht of Hanau-Münzenberg: Albert of Hanau-Münzenberg (12 November 1579 – 19 December 1635 in Strasbourg) was the younger son of Philip Louis I of Hanau-Münzenberg (1553-1580) and his wife, Countess Magdalena of Waldeck (1558-1599).  The only sons of his parents to reach adulthood were Albert and his elder brother Philip Louis II.  Albert's son John Ernest was the last male member of the Hanau-Münzenberg line of the House of Hanau.

Edwin Brockholst Livingston: Edwin Brockholst Livingston (1852-1929) was an amateur historian.  His lifetime work was the research and publication of the genealogy of the Scottish Livingston family of Callendar, and the offshoots of the family that sought their fortune in colonial America.  These included, Robert “the Founder”, Governor William Livingston of New Jersey and his brother Philip who was a signer of the Declaration of Independence, Judge Robert R. Livingston of Clermont and his son, plus Edward Livingston, the friend and adviser of Andrew Jackson.

Philip Livingston (1686–1749): Philip Livingston (July 9, 1686 – 1749), the son of Robert Livingston the Elder, and elder brother of Robert Livingston of Clermont.  Philip was the second Lord of Livingston Manor, a merchant, and slave trader.

Adolf III of Nassau-Wiesbaden-Idstein: Count Adolf III of Nassau-Wiesbaden-Idstein (by a different way of counting: "Adolf IV"; 10 November 1443 – 6 July 1511) was a son of Count John II of Nassau-Wiesbaden-Idstein and his wife Maria of Nassau-Dillenburg (1463–1504).  After his father's death in 1480, he ruled Nassau-Wiesbaden and his brother Philip ruled Nassau-Idstein.  After Philip's childless death in 1509, Adolf III ruled also ruled Nassau-Idstein.

Kip-Beekman-Heermance Site: Kip-Beekman-Heermance Site is a historic archaeological site located at Rhinebeck, Dutchess County, New York.  The site includes the ruins of the Kip-Beekman-Heermance House built 1700 by Hendrick Kip, Patentee.  It was also the home of Col. Henry Beekman, Jr. later of his Grandson Col. Henry Brockholst Livingston (1757 - 1823).  It was destroyed by fire in the early 20th century.  The house was of such local prominence that Franklin Delano Roosevelt based the design of the Rhinebeck Post Office on the manor house and used the ruins for the stone construction of the building.

Philip Livingston: Philip Livingston was an American merchant and statesman from New York City.  He was a delegate for New York to the Continental Congress from 1775 to 1778, and signed the Declaration of Independence.

Cleopatra of Macedon: Cleopatra of Macedon (Greek: Κλεοπάτρα ; c. 355/354 BC – 308 BC), or Cleopatra of Epirus, was an Epirote-Macedonian princess and later queen regent of Epirus.  The daughter of Philip II of Macedon and Olympias of Epirus, she was the only full sibling of Alexander the Great.  Her other siblings include half sisters Thessalonike and Cynane, and half brother Philip III of Macedon.

Alexander of Megalopolis: Alexander of Megalopolis (Greek: Ἀλέξανδρος ) was originally a Macedonian, but he received the franchise and was settled at Arcadian Megalopolis about 190 BC.  He pretended to be a descendant of Alexander the Great, and accordingly he called his two sons Philip and Alexander.  His daughter Apama was married to Amynander king of Athamanians.  Her eldest brother Philip, followed her to her court, and being of vain character, he allowed himself to be tempted with the prospect of gaining possession to the throne of Macedonia.

Supporting paragraphs: Edwin Brockholst Livingston Philip Livingston
Answer: the Declaration of Independence