Their mum says they wanted to help the Bingley-based charity that supports the family.
So far they have clocked up just over 51 miles of their, walking to and from school, cycling with their friends on a lunchtime and enjoying family activities on a weekend.
Mrs Ratcliffe said: "The boys are absolutely full of energy. They don't give up easily so have really embraced it. "We have a tally chart in the kitchen marking off how many miles have been done and they are very precise in filling it out."The 40-year-old said they have had fantastic support from their school Menston Primary with pupils joining in the challenge.
"The boys are like little celebrities and don't bat an eyelid at getting out and clocking up more miles," she said."We're incredibly proud of them but we all might need to hibernate in November to recover."
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