The Roberts/Du Hamel battle was one of the best of the 1970s, but that was Kenny and Yvon. Their sons kept the battle going into the next generation. Here’s Miguel Duhamel and Kurtis Roberts keeping the old family rivalry alive at Daytona in 2003. Both were on Honda V-Twin RC51 Superbikes, one of my favorite Superbikes ever.
From Wiki:
The RC51 was described as “packed with race-age technology” by one motorcycling journalist. The engine is a 999cc dual overhead cam V-twin unit with two fuel injectors and four valves per cylinder. Power is delivered to the rear wheel by a close-ratio, six-speed transmission. The chassis is constructed from aluminum alloy, being a twin-spar design.
This photo was taken with a $300 Olympus E-100RS digicam.

Miguel Duhamel (17) and Kurtis Roberts (80) race their Honda RC51 Superbikes at Daytona in 2003. (Larry Lawrence photo)