McCartney was born on 18 June 1942, in Walton Hospital, Liverpool, England, where his mother, Mary (née Mohin), had qualified to practise as a nurse. His father, James ("Jim") McCartney, was absent from his son's birth due to his work as a volunteer firefighter during World War II.

Paul has one younger brother, Michael (born 7 January 1944). Though the children were baptised in their mother's Roman Catholic faith, their father, a former Protestant turned agnostic, felt Catholic schools sacrificed the education of their students for the sake of their religious teachings, so he and Mary did not emphasise religion in the household.

Paul McCartney's Family Tree