Parents
- Alphonse de Cassin (1795 - 1871), baron de Cassin, capitaine de cavalerie dans la Garde royale
- Stéphanie Fournier de Boisayrault d'Oyron (1808 - 1866)
Family
- Married on June 24, 1874 in Paris, at 7e, with Charlotte de Blou (1847 - 1875), issuing
Pierre (1875 - 1929)
- Married on July 2, 1883 in Paris, at 8e, with Marie de La Chère (1847 - 1921)