Christopher Bouskill, 40, and his 45-year-old brother Stephen, both of Rotherham, entered an electrical shop on High Street in Wath on October 26, 2019, and made threats to the 78-year-old owner before stealing his wallet and £700 from the till.
Investigating PC Jessica Pearce said: “The brothers’ actions that day caused an innocent man to fear for his life.
“The victim, who was 78 at the time, was pushed to the floor, attacked, and robbed while being threatened at knife point.
“The man’s bravery and commitment to assisting with the investigation throughout is to be admired.
“Luckily, 40-year-old Christopher Bouskill drove his getaway car in to floodwater as he left the scene, and after being stranded was apprehended by one of our police dogs.”
Christopher was then linked to a burglary on Church Street in Swinton just three days before, where a number of valuable items were stolen.
Stephen was also linked to another burglary on October 17 where almost £10,000 of jewellery was stolen from an address in Rawmarsh.
PC Pearce added: “The Bouskill brothers are nasty and prolific offenders both of them a blight on the Rotherham community.
“I am pleased that justice has been done, and both are behind bars for a significant period of time.”
Both brothers were sentenced to ten years behind bars after admitting the charges.