McGee married Elizabeth Crotty and the couple had nine children, six sons (Charles, D'Arcy, Frank, James, John Jr. and Walter) and three daughters, (Katharine, Lillian and May).
The renowned McGee tied the knot with Elizabeth Crotty, and together they brought forth nine children, comprising six male offspring (Charles, D'Arcy, Frank, James, John Jr., and Walter) and three female children (Katharine, Lillian, and May).