There were hugs, cheers and tears as two brothers completed the final marathon of a 33-day challenge to run 33 marathons, raising £1.5m for dementia research.

Jordan and Kian Adams from Redditch, Worcestershire, were cheered on by hundreds of supporters as they crossed the finish line in central Dublin to complete their final marathon.

Their mother Geraldine died aged 52 after being diagnosed with frontotemporal dementia (FTD).

They also have a rare gene that causes the condition, meaning they are likely to develop it in their 40s.

The pair, known as the FTD Brothers, began their challenge by running the London Marathon before completing a marathon in each of Ireland's 32 counties over the next 32 days.

Speaking at the finish line, Jordan said he knew he wanted to make an impact on the world on the day he left hospital and found out he had the gene.

He described his mother as "beautiful, full of life, a cool mum - you couldn't wish for a better mother".

Later Jordan told people he will lose his life "probably in the mid to late 40s".

"The hand you're dealt can eat you or you can walk through the door where you can use it as a powerful message to the world", he said.

"To show that the time you have here or the card you've been dealt doesn't matter, you have a choice on how you play your hand."

After crossing the finish line they met the Tánaiste (Irish deputy prime minister) Simon Harris and other ministers to thank them for raising awareness of FTD.

An Irish government spokesperson said the ministers agreed to look at providing further support for people with dementia in Ireland, including exploring the potential for a national centre of expertise for early detection, research and therapy.

The brothers began their final marathon at 09:30 in north Dublin before crossing the finish line at Merrion Square at about 14:30.

They were cheered on by hundreds of spectators in the park and crossed the finish line with friends and family, including sister Kennedy Faramont, while their father John and grandfather Glen watched.

Their challenge began with the London Marathon, where Jordan ran with a fridge on his back.

Before starting the challenge, Jordan told the BBC he wanted to do something different and "start asking other people questions who don't know our story".

They then travelled to Ireland to begin their marathon odyssey across the island the next day.

The brothers also received a letter of congratulations from the Duke of Cambridge, who wrote that he was "very impressed by your inspiring journey and ambitious challenge to run 32 consecutive marathons in Ireland".

Although the brothers grew up in England, their mother's roots are in Ireland, where several of their family members also suffer from FTD.

Kian said the many marathons had given them the opportunity to reconnect with relatives in Ireland, where their mother was "taken many times" as a child.

"It's really nice to go back to Longford and Leitrim, to go where our grandfather went to school, where our grandmother grew up, it was very special."

Speaking to BBC Radio Ulster's Good Morning Ulster programme before they started, Kian said they were "tired" and Jordan said it had been "33 tough days".

The sunny weather accompanied them in Dublin, as well as supporters, with people being encouraged to join the run, with limited numbers for security in its early stages.

For the final 10km, only friends and family were allowed to join Jordan and Kian as they headed for the finish line.

Their father Glen Adams was at the finish line - he said his sons are "really nothing but ordinary middle-class boys from a small market town in the Midlands".

Their grandfather John says: "It's hard to say how proud I am of them. They're great."

He said the gene for resilience and determination is "inherited right through the whole family".

John accompanied his grandchildren for most of their marathon challenge across the island of Ireland, as well as returning to England to care for his partner, who has dementia.

When describing the people of Ireland, he said they were "very generous, every person I spoke to was very kind".

Kennedy Faramont, their sister, said she is "very thankful they didn't just pass it [the diagnosis] by".

"They're actually using every day and I'm very proud of them."