The Boyle family of Jim, Denyse, Frazer and Ross will be joined by family friend Harris Leslie as they take on the Three Peaks Challenge in aid of the Costa Foundation.
Mum Denyse, who previously managed branches in Gretna and Dumfries, will drive her husband Jim, their two sons and their friend between Mount Snowdon in Wales, Scafell Pike in England and Scotland’s Ben Nevis.
Coffee chain Costa, where four of the five are employed, has organised the charity event to raise money to help build better lives in coffee-growing communities around the world.
The money will be used to build schools and provide education.
Speaking on behalf of the group Denyse, a brand excellence coach for Scotland and the north of England, said: “We are all nervous about the challenge as it is a huge commitment.
“But, also really excited about being a part of 30 teams working together to provide a school for people of all ages who want to learn.”
The walkers have been practising by scaling local climbs, including Waterloo Monument, Criffel and Tinto Hill.
They also took part in a practice run at Scafell Pike, in the Lake District, earlier this month.
Denyse added: “It is a hard challenge, but nobody is forced to complete it as safety is paramount.
“Generally all the participants do all peaks and it is a massive demonstration of team effort.
“The overall aim for fundraising is £100,000 which is enough to build a school, we hope to raise £250 per individual, so £1250 from the Lockerbie crew.
“We pay all our own expenses, so all donations go directly to the charity.”
Donations can be made via sponsorme.co.uk/costafoundation/bane.aspx