His father Rigby was an MP for Ipswich (1831–37) before Cathcart was born, and his brother Eugene represented two UK constituencies (South Ayrshire and Clackmannanshire and Kinross-shire) at various times between 1885 and 1918.
Eleanor Rigby | Edward Rigby | Cathy Rigby | Arthur Rigby | Amy Rigby | Murder of Lee Rigby | murder of Lee Rigby | James Rigby | Emma Rigby | St John Rigby College, Wigan | St John Rigby College | Rigby Wason | Rigby | Richard Rigby | Portia Duval-Rigby | Gordon Rigby | Francis Rigby |