JONATHAN and David Shepherd put family values aside as they go head-to-head in the ELF Renault Clio Cup.
The Sandbach duo are both entered in the high-speed competition this year, and are well aware of the fact there could be a clash of personalities on the track.
Andy Sayle, who represents the drivers as manager of Team Gladman, said: 'I think they both want each other to do well - but want to come out on top at the same time.
'The grids are large in this competition, but they know it is inevitable they will come across each other during a race. I think they may ease off slightly if that happens - but not much.'
Dad Jonathan, 50, and son David, 20, both have a couple of years racing experience, but it is their first season in the Clio contest - a one-make saloon car series now in its eighth year.
They got off to a solid start in the first round at Brands Hatch. Driving the new two-litre 205bhp model, the Shepherds came up against some of the best drivers in the UK, in front of thousands and on live TV.
Racing as part of Congleton-based Amery Motor-sport, they avoided each other by taking part in separate qualifying races.
Property developer Jonathan was first up, and managed to make it through to the final with several good passing manoeuvres.
Student David was less fortunate. Having made a good start he was collected by another car that had pitched into a spin at Surtees, forcing him off the track. He rejoined the race with a damaged car but was unable to join the top 16 qualifiers.
Lining up on the 14th row of a full grid in the final, Jonathan was dealt an early blow when he was nudged from behind and pushed into a sideways slide at nearly 100mph, before being hit by another car. He rejoined at the back and battled to finish 24th.
Jonathan said: 'It's a shame we both couldn't make the final. But we knew it would be a baptism of fire. Our aim is to use 2007 as big a learning curve, and have fun along the way.'
Nine of the 10 Clio Cup events are held in support of the British Touring Car Championship (BTCC). They travel to Rock-ingham next, on April 21.