Sean Brosnan is the son of Cassandra Harris (d. 1991) and Pierce Brosnan, who was married to Cassandra from 1977 until her death on 28 December, 1991. He has a half/adopted sister and half/adopted brother, Charlotte Brosnan and Christopher Brosnan (daughter and son of Cassandra and Dermot Harris, who were adopted by Pierce after Dermot died in ...