Patrick was born on April 4th, 1875 in Poynstown. Patrick's father was William Cahill and his mother was Bridget Burke. His paternal grandparents were John Cahill and <Unknown>; his maternal grandparents were John Burke and <Unknown>. He had two brothers and three sisters, named Thomas, William, Alice, Hanorah and Mary. He was the second oldest of the six children. He died at the age of 47 on March 26th, 1923 in Poynstown.