Jim's father, Joseph "Joe" McCartney (born 23 November 1866) was a tobacco-cutter by trade when he married Florence "Florrie" Clegg (born 2 June 1874) in the Christ Church, Kensington, Liverpool, on 17 May 1896. Joe never drank alcohol, went to bed at 10 o'clock every night, and the only swear word he used was "Jaysus". Florrie was known as "Granny Mac" in the neighborhood and was often consulted when families had problems.
Jim was born at 8 Fishguard Street, Everton, Liverpool and was the third eldest of seven children. The McCartney children were John (Jack), Edith, James (Jim), Ann, Millie, Jane (Jin) and Joe (who was named after a brother who died in infancy). Joe and Florrie McCartney moved shortly after Jim's birth to 3 Solva Street in Everton, which was a run-down terraced house about three-quarters of a mile from the Liverpool city center, where Jim attended the Steers Street Primary School off Everton Road. After leaving school at 14, Jim found work for six shillings a week as a cotton "sample boy", at A. Hanney & Co.; a cotton broker in Chapel Street, Liverpool. Jim's job entailed running up and down Old Hall Street with large bundles of cotton that had to be delivered to cotton brokers or merchants in various salesrooms. He worked ten-hour days, five days a week, although he received a bonus at Christmas that was almost double his annual salary.
When World War II started Jim was too old to be called up for active service, as well as having previously been disqualified on medical grounds after falling from a wall and smashing his left eardrum when 10 years old. After the cotton exchange closed for the duration of the war, Jim worked as an inspector at Napier's engineering works, which made shell cases that were later filled with explosives. He volunteered to be a fireman at night and often watched Liverpool burning from his rooftop observer's position. He met his future wife Mary McCartney during an air raid on Liverpool in 1940, when he was 38 years old, and had settled into what his friends thought was, "a confirmed bachelorhood." Mary had been too career-conscious to think of marriage and, at the age of 31 years, was thought of as a spinster. They met in June 1940, at 11 Scargreen Avenue, West Derby, the McCartney family home. Mary was staying with Jim's sister, Jin, because of the lack of accommodation in Liverpool at the time. After the war he worked as an inspector for Liverpool Corporation's Cleansing Department before returning to the cotton trade in 1946.
Their sons Paul McCartney (born 18 June 1942) and Mike McGear' (born 7 January 1944) were both delivered in the Walton General Hospital in Rice Lane, Liverpool, where Mary had previously worked as a nursing sister in charge of the maternity ward. After she had been diagnosed with cancer, Mary still carried on cycling to work, but often doubled up in pain and had trouble breathing. The day Mary was due to have a mastectomy operation, she cleaned the McCartney house and laid her two sons' school clothes out; ready for the next day. She said to Dill Mohin, her sister-in-law, "Now everything's ready for them in case I don't come back." Mary died of an embolism on 31 October 1956, after an operation to stop the spread of breast cancer. Her last words to Dill Mohin were "I would love to have seen the boys growing up." Mary was buried on 3 November 1956 at Yew Tree Cemetery, Finch Lane, Liverpool.
Eight years after Mary's death, Jim married Angela Williams, on 24 November 1964. Williams had a daughter from a previous marriage, Ruth McCartney, whom Jim legally adopted. Jim died of bronchial pneumonia on 18 March 1976. His second wife, Angela said that his last words were "I'll be with Mary soon." Jim died two days before a Wings European tour; his eldest son was unable to attend the funeral. Jim was cremated at Landican Cemetery, near Heswall, Merseyside on 22 March 1976.