Question: Who has descendants which retain possession of an unincorporated island near Knox County, Maine?

Context articles: Knox County Airport
Tim Burchett
Edina Double Square Historic District
Knox Mills, Wisconsin
Eagle Island (Penobscot Bay, Maine)
Spirit of Vincennes, Inc
Knox County Jail
North Haven, Maine
Knox County Courthouse (Knoxville, Illinois)
Knox County Regional Airport

Knox County Airport (FAA LID: 4I3) is a public use airport located four nautical miles (7 km) southwest of the central business district of Mount Vernon, a city in Knox County, Ohio, United States.
 It is owned by Knox County Airport Authority.
Timothy Floyd Burchett (born August 25, 1964) is an American Republican politician, currently the mayor of Knox County, Tennessee.
 He previously served in Tennessee General Assembly, first in the Tennessee House of Representatives and later in the Tennessee State Senate, in which he represented Tennessee's District 7, part of Knox County.
 On August 5, 2010, Burchett was elected mayor of Knox County, replacing Mike Ragsdale.
 Burchett is currently a candidate for the Republican nomination for Tennessee's 2nd congressional district in the 2018 elections, with the incumbent John Duncan Jr. retiring.
Edina Double Square Historic District is a national historic district located at Edina, Knox County, Missouri.
 The district encompasses 37 contributing buildings in the central business district of Edina.
 It developed between about 1865 and 1945 and includes representative examples of Italianate and Streamline Moderne style architecture.
 Notable contributing buildings include the Public Works Administration funded Knox County Courthouse (1934-1935) designed by William B. Ittner, Bishoff Bakery (1891), Northern Hotel (1860s), Ennis House/Northern Hotel (c. 1865), Edina School and Gymnasium (1915-1916), D. H. Mudd Building (c. 1904), Phillip Linville Building (c. 1908, c. 1963), Tobias J. Lycan Building (c. 1891), Jacob Pugh Building (c. 1891), Albert G. Bostick Building (c. 1891), Knox County Savings Bank (c. 1891), Thomas Burk Buildings (c. 1881), Bank of Edina Building (c. 1907), Joseph F. Biggerstaff Buildings (c. 1881), Stablein Building (c. 1870), and Knox County Public Library (c. 1915).
Knox Mills is a ghost town in the town of Knox, in Price County, Wisconsin, United States.
 The community was located on Old Mill Road, near Knox Creek, just off County Highway D, between the unincorporated communities of Brantwood and Spirit.
Eagle Island is a 263-acre island in Penobscot Bay, Maine, between North Haven and Deer Isle, in Hancock County.
 It is not part of the nearby Town of Deer Isle but is an unincorporated territory of the state.
 The island was conveyed to Samuel Quinn by John C. Gray on November 18, 1844, with the exception of a small lot containing Eagle Island Light, which Gray had previously deeded to the government.
 Quinn also bought from Gray one-half of Fling Island and "all Farming Tools, hay and neat stock and sheep belonging to said John C. Gray on said Eagle Island" for $1500.
 His descendants still own a majority of Eagle Island and continue to live there.
Spirit of Vincennes, Inc is a non-profit organization dedicated to historic preservation and education in Vincennes and Knox County, Indiana, US.
 The group awards scholarships to graduates from each of the Knox County high schools, and presents a "Long Knife" award to individuals who help promote the history of Knox County.
The Knox County Jail, located on the public square in Knoxville, is a former county jail used by Knox County, Illinois.
 Built in 1845, the jail was the second used in the county; it replaced a log jail which was thought to be insufficiently secure.
 Contractor Alvah Wheeler built the two-story brick building for $7,724.
 The county's only official hanging was conducted at the jail in 1873, when John M. Osborne was executed for the murder of Adelia Matthews; several hundred people came to watch his execution.
 Later in the same year, the county seat and the jail were both moved to Galesburg; the Knoxville jail is now part of the Knox County Museum.
North Haven is a town in Knox County, Maine, United States, in Penobscot Bay.
 The town is both a year-round island community and a prominent summer colony.
 The population was 355 at the 2010 census.
 North Haven is accessed by three-times daily ferry service from Rockland, or by air taxi from Knox County Regional Airport.
The Knox County Courthouse, located on the public square of Knoxville near its associated hall of records, is the former county courthouse of Knox County, Illinois.
 The courthouse was built in 1840 to replace the county's first courthouse; built in 1831 shortly after the county's organization, it had been outgrown by the end of the decade.
 Architect John Mandeville gave the building its Greek Revival design.
 The Hall of Records, which was also designed by Mandeville, was added in 1854 to house county records after the courthouse ran out of space for them.
 The Knox County seat moved to Galesburg in 1873; the courthouse and hall of records subsequenty housed the Knoxville city hall and public library respectively until 1978, when the city government moved to the hall and the courthouse became a museum.
Knox County Regional Airport (IATA: RKD, ICAO: KRKD, FAA LID: RKD) is a county owned, public use airport in Knox County, Maine, United States.
 It is located three nautical miles (6 km) south of the central business district of Rockland, Maine.
 The airport serves the residents of midcoast Maine with commercial and charter aviation services.
 Scheduled airline service is subsidized by the Essential Air Service program.
 It is also a major hub of freight and mail service to Maine's island communities including Matinicus, North Haven and Vinalhaven.