Patrick and Charlotte Waller, from Coronation Road, Ascot, are running a marathon in Antarctica on November 20 and then another in Chile 11 days later, their last two continents together.
Only two other father-and-daughter groups have achieved this feat – running 26.2-mile events in Europe, Asia, South America, North America, Africa, Australasia and Antarctica.
Mr Waller said: “It’s getting a bit more real, I think Charlotte’s apprehensive as it’s 40-50% harder than a normal marathon; it’s quite demanding and trying!
“I’ve been running about 25-35 miles a week; this Sunday I’m going to do 20 miles of training. Me and my daughter are also going to go to Norway for a weekend and run around there to get used to the cold.”
They ran their first marathon when 25-year-old Charlotte was 18, in Berlin in 2005.
Mr Waller explained: “She had always wanted to run a marathon, so for her 18th birthday I said ‘find a nice European marathon and I’ll pay for the flight’, and then we ran the whole thing together.”
After Berlin, they took on Sydney in 2007, Chicago in 2008, and Marrakesh and Japan on 2010.
Mr Waller has already completed seven marathons on seven continents, becoming the 40th person to do so in 2010.
He said: “We have got a really close bond; it will be a really cool thing to do together. We like to do stuff other than just watching TV.”
Despite damaging his lungs and losing 20% of his lung capacity, Mr Waller is confident he will complete the Antarctica Ice Marathon, with temperatures reaching -40 degrees celsius, in around five hours.
Mr Waller is raising money for Daisy’s Dream, a Berkshire charity that helps parents and families affected by bereavement or children with ling term illnesses.
Miss Waller is raising money for the wildlife charity, the World Wildlife Fund (WWF).
To make a donation visit her justgiving page www.justgiving.com/Charlotte-Waller