Fernand Bonsor was born in 1862 in France, the son of Robert and Louise Bonsor. His father was a dye manufacturer. Fernand, his elder brother Robert, younger brother Morris, and both parents, were born in France, though British subjects. The family moved to
Shipley sometime after 1871 and Fernand soon became known as Fred. In his latter teens he studied for the Civil Service examination although his profession by his late twenties seemed to follow his father into industry, being a wholesale bottler and agent. During July–September 1885 he married Fannie Milnes of Halifax in Bradford district. The marriage was an unhappy one and the couple were granted a separation order in July 1894 after Fannie testified that Fred assaulted her several times. ==Rugby union career==