Mel Colmcille Gerard Gibson was born January 3, 1956. He is an American actor and filmmaker. Gibson was born in Peekskill, New York, the sixth of eleven children, and the second son of Hutton Gibson, a writer, and Irish-born Anne Patricia (née Reilly, died 1990). Gibson's paternal grandmother was opera contralto Eva Mylott (1875–1920), who was born in Australia, to Irish parents, while his paternal grandfather, John Hutton Gibson, was a millionaire tobacco businessman from the American South. One of Gibson's younger brothers, Donal, is also an actor. Gibson's first name is derived from Saint Mel, fifth-century Irish saint, and founder of Gibson's mother's native diocese, Ardagh, while his second name, Colmcille, is also shared by an Irish saint and is the name of the Aughnacliffe parish in County Longford where Gibson's mother was born and raised. Because of his mother, Gibson retains dual Irish and American citizenship. Gibson's father was awarded US$145,000 in a work-related-injury lawsuit against the New York Central Railroad on February 14, 1968, and soon afterwards relocated his family to West Pymble, Sydney, Australia. Mel was twelve years old at the time. The move to his grandmother's native Australia was for economic reasons, and his father's expectation that the Australian Defence Forces would reject his eldest son for the draft during the Vietnam War. Gibson was educated by members of the Congregation of Christian Brothers at St Leo's Catholic College in Wahroonga, New South Wales, during his high school years.

For more information press link below:

https://en.wikipedia.org/wiki/Mel_Gibson