One of their sons, Harrison S. Larkin, was a first lieutenant in the United States Air Force and was killed when his plane crashed on April 28, 1950.

After the Attack on Pearl Harbor, he was personally selected by Major General John C. H. Lee in May 1942 to serve as Chief of Staff, Headquarters, Services of Supply, United States Army Forces in the British Isles.

For his efforts in supplying the combat troops during the Tunisian campaign he was awarded the Distinguished Service Medal in June 1943.

He was also awarded an Oak Leaf Cluster to the Distinguished Service Medal in November 1944 for his support of the 5th Army in Italy, and his role in planning the invasion of southern France.

Larkin died at Walter Reed Army Hospital on October 17, 1968, and was buried at Arlington National Cemetery.