Prince of Wales William writes a letter to two brothers taking part in a 33-marathon challenge across Ireland to raise funds for dementia research. Multiple outlets report that the brothers are undertaking the event as a test of endurance while supporting efforts related to dementia. The letter from William is presented as recognition and encouragement for their fundraising activity. One report notes that the challenge involves completing 33 marathons, indicating the breadth and sustained nature of the undertaking across different locations in Ireland. Another account confirms that the brothers receive the letter directly, highlighting the personal outreach from the Prince of Wales. The coverage is consistent across sources: William communicates his view of the brothers’ effort as inspiring and offers support for their campaign. The reports do not add further details about the brothers’ names, the specific charities involved, or the date the letter was written, beyond confirming the nature of the challenge and the receipt of the letter.