On 14 October 1926, Cary married Joan Sylvia Southey.

They had two daughters before divorcing in 1933: Cary married again on 9 August 1933, to Constance Mary Berry.

They had one son: On 21 February 1941, he was commissioned as a pilot officer on probation, in the Administrative and Special Duties Branch of the Royal Air Force.

He pled guilty to all the charges and received a six-month suspended sentence and a £1,140 fine.

Children's rights campaigners were shocked and outraged at the lenient sentence.