Jack was married twice. He got married to his first wife long time ago. He also had two lovely daughters from this married life; however, this married life came to an end in divorce. After that he began his love affairs with Lilian Welsh. They got married few years later. They were happy to have each other as their loving spouse.
As Jack's mother was also a music talent, he became interested in music since a young age. When he was just 11, he began playing piano. He used to perform with his brother and sister in church concerts and parties. Later he and his brother Tom began working in a painting and decorating company. In 1958, he came back from national service and then he formed The Alexander Brothers with his elder brother Tom. That year they took part in talent contest and they also won this contest winning a recording contract. They became popular with the release of the single, Nobody's Child in 1964. Their album, These Are My Mountains was released two years later which also entered into the UK Albums Chart at no 29. His annual salary and net worth was high.