Brosnan married Australian actress Cassandra Harris in 1980 and adopted her two children, Charlotte (birth November 27, 1971 - June 28, 2013) and Christopher (birth October 6, 1972) after their father died in 1986. Brosnan and Harris had one son together, Sean (birth September 13, 1983).
On December 28, 1991, one day after their 11th wedding anniversary, his wife, Cassandra Harris, died in his arms. She died of ovarian cancer.
Brosnan met Australian actress Cassandra Harris through David Harris, one of Richard Harris' nephews, in 1977, shortly after he left drama school. On meeting her, he has described his feelings, saying, "What a beautiful looking woman. I never for an instant thought she was someone I'd spend 17 years of my life with. I didn't think of wooing her, or attempting to woo her; I just wanted to enjoy her beauty and who she was." They began dating, and eventually bought a house in Wimbledon. They married on 27 December 1980 and had one son together, Sean, who was born on 13 September 1983. They lived with her children, Charlotte (1971-2013) and Christopher, and after their father Dermot Harris died in 1986, he adopted them and they took the surname Brosnan.