Robert Knox (died 19th September 1924)

Robert was born in Scotland in 1855 and was Archibald's oldest brother. He seems to be the only Knox who had children. Sons - John and James and daughters - Clino, Margaret and Annie. His wife was Margaret Ann Knox.

Robert joined his father's firm and was an engineer.

After his father's death in 1901 he had his own marine engineering firm and owned several vessels. Very well regarded as an engineer and some of the firm's work was sent to all parts of the world.