Another son, Charles Cobb Lanphier, was also a pilot. He was a Captain in the United States Marine Corps attached to VMF-214 (the Black Sheep squadron) when his F4U Corsair crashed during a mission at Bougainville Island on August 28, 1943. He was captured and on May 15, 1944 he died of neglect while in captivity at a prison camp in Rabaul, Papua New Guinea. His remains were recovered and 1st Lt. Charles C. Lanphier, USMC was interred at Arlington National Cemetery, April 5, 1949.