Blyth was a first cousin of Arthur Blyth, who was three times premier of South Australia in the 19th century.
After the death of both parents – Benjamin Blyth in 1866 and Mary Dudgeon Wright in 1868 – Blyth and his siblings were brought up by their mother's sister, Elizabeth Scotland Wright.
Benjamin Franklin | Benjamin Britten | Benjamin Harrison | Benjamin Disraeli | Benjamin Netanyahu | Walter Benjamin | Benjamin West | Benjamin Zephaniah | Benjamin Rush | Breaking Benjamin | George Benjamin | Benjamin Spock | Benjamin | Benjamin N. Cardozo School of Law | Blyth | Benjamin Silliman | Benjamin Lincoln Robinson | Blyth, Northumberland | Benjamin Ferrey | Benjamin Bratt | George Benjamin (composer) | Benjamin Zuckerman | Benjamin Wilson | Benjamin Percy | Benjamin Millepied | Benjamin Jowett | River Blyth | Benjamin Thompson | Benjamin Lincoln | Benjamin Insfran |
Through another family connection, his cousin Benjamin Blyth, Peddie also secured work for the Caledonian Railway at their Princes Street station (demolished).