He married Frances Gilbert, from Fairbanks, and had six children: Patty,
John Jr. (who succeeded him as a state legislator), twins Jerry and Jim, Paula, and Jeff. His father, William A. Coghill, emigrated to the United States from
Scotland and chose to come straight to Alaska. He was a pioneer who hiked to the Interior from
Valdez, worked as a printer for what is now the
Fairbanks Daily News-Miner, and then opened a trading post in Nenana. The Coghill General Store is still in operation and owned by the family. Coghill had two older brothers, William F. (deceased, Col. U.S. Army Ret. and former CFO of the
Alaska Railroad) and Robert A. Sr. (deceased, managed Coghill's Store after the death of William A.), who stayed in Alaska their entire lives. He published his autobiography, "Growing up in Alaska" in 2009 describing his personal and political life in the 49th state, as one of its last surviving state constitution signatories. Coghill died on February 13, 2019, at the age of 93. ==References==