They often tease each other relentlessly, something 17-year-old Bryony confesses she “secretly loves.” But, despite the usual sibling squabbles, Bryony is her little brother’s biggest and most supportive fan.

Harry, 15, has cerebral palsy, autism, dyslexia and impaired hearing and vision — but it has never stopped him doing what he loves.

The youngster, from Bridge of Weir, was last month nominated by the Royal Blind School to take part in the Queen’s Baton Relay.

And it was Bryony who remained his biggest cheerleader, strengthening the already inseparable bond between the two.

Now, to prove her dedication, the doting sister has taken part in an act she despises — running — all for her brother.

She took part in the Colour Me Rad 5K on Saturday (August 23) in Livingston to raise money for the Royal Blind Charity.

“I wanted to give something back to the school because Harry has come on leaps and bounds since starting there,” Bryony explained.

“Harry was shocked when I told him that I’d be doing the 5K because I absolutely hate running! But it’s for a good cause so it was worth it in the end.” Alongside her friend Elaine Mitchell, 18, Bryony put her best foot forward to raise cash for the school which has supported Harry through his teenage years.

Bryony suffers from problems with her knees, which she says has made her ‘hate’ running.

But the Gryffe High pupil told The Gazette Series she was ‘determined’ to give something back to the charity.

She said: “I’ve always had problems with my knees so the only exercise I can really do is dancing.

“They used to give me quite a bit of pain so Harry was pretty surprised when I chose to do a 5K.

“In fact, he started laughing at me when I told him! But that’s Harry for you.

“I chose the Royal Blind Charity because they’ve helped Harry to come on so much.

“I’ve never seen him so confident and able to do so many things.

She added: “It’s just good to see how far he’s come, even in the last year.” Bryony and Harry’s mum, Fiona, believes Harry is ‘miraculous’ as he loves playing sport despite being told he may never be able to walk, talk or see.

It wasn’t until he was three that doctors discovered Harry’s conditions, leaving the family floored by the devastating diagnosis.

“It took 53 doctors to finally discover what was wrong with Harry,” mum Fiona said. “I was at the end of my tether.

“Then, when we finally knew, we were just elated that we could do something about it and get him the help he needed.

“Harry still has lots of challenges. He has lots of hospital appointments but he now does so many things he was told he might never do.” And, despite his enormous struggles, the hardy youngster is obsessed with sports. He has practicing Judo for the past four years — and even got the chance to meet the Queen on her 80th birthday.

“Harry is Harry,” Fiona says simply. “He doesn’t see himself as inspirational.

“He was just diagnosed with Joubert’s syndrome before Christmas last year too.

“They thought Harry had a tumour on his pituitary gland but they found out he had the rare condition after a brain scan.

“Jourbert’s affects motor function. It can affect your liver and your kidneys, his vision has deteriorated since this diagnosis.” Fiona said there is a chance that Harry will lose his vision altogether, something the schoolboy refuses to let himself get down about.

She went on: “The day that we were told that I got upset and Harry turned round to me and said, ‘I don’t know why you’re upset mum, some of my friends are blind’.

“That sums up how he just gets on with things and does them. To him, he is just a normal teenage boy.

“Bryony is just the most magical sister Harry could have had. She has encouraged and pushed him since they were tiny and continues to do so now. We have a video of her cheering him on as he carried the baton. That sums up how she has cheered him on throughout his life.” Bryony and her friend Elaine have raised more than £180 for The Royal Blind School. To donate, visit https://www.justgiving.com/bryonyelaine