McCay's daughter Mardi matriculated from Sacré Cœur School in 1914 and earned Master of Arts and Diploma of Education degrees from the University of Melbourne. In 1922, she entered the Society of the Sacred Heart. She taught at Convent of the Sacred Heart, Rose Bay in Sydney (now Kincoppal-Rose Bay) until 1956 when she returned to Sacré Cœur as Mistress of Studies. Bixie also attended Sacré Cœur and the University of Melbourne, at Janet Clarke Hall, where she became only the third woman in Victoria to earn a Master of Laws degree, and was enrolled as a barrister on 10 June 1925. Like Joan Rosanove, she could not obtain room in the Selborne Chambers, as women were not allowed to do so, so she put up her plate in the building next door. McCay followed his daughter and became a barrister, enrolling on 8 October 1925. In 1930, she married George Reid, a young barrister who later became Attorney-General of Victoria.