Prince William, the Duke of Cambridge, has one brother, Prince Harry, the Duke of Sussex. The two brothers are the sons of Prince Charles and the late Princess Diana, and they are second and sixth in line to the British throne, respectively.

Prince Harry was born on September 15, 1984, in Paddington, London, and is three years younger than his older brother. Like William, he attended prestigious schools and universities, including the Wetherby School, Ludgrove School, and Eton College. However, unlike William, Harry did not continue on to university after finishing secondary school.
Harry joined the British Army in 2005 and served for ten years, rising to the rank of captain. During his military service, he completed two tours of duty in Afghanistan and became an advocate for the welfare of veterans and service members.
In addition to his military service, Harry has also been involved in a variety of charitable and philanthropic endeavors. He has served as a patron for numerous organizations, including Sentebale, a charity that supports children affected by HIV/AIDS in Africa, and the Invictus Games Foundation, which organizes international sports competitions for wounded, injured, and sick service members.
Harry is also known for his advocacy work on mental health issues. Along with his brother William and sister-in-law Kate, the Duchess of Cambridge, he founded the mental health initiative Heads Together in 2016, which aims to reduce stigma and improve support for people with mental health challenges.
Harry has had a tumultuous personal life, including a very public divorce from his first wife, American actress Meghan Markle, and his decision to step back from his royal duties and move to the United States with his family. However, he has remained active in his charitable work and has continued to use his platform to advocate for causes that are important to him.
Overall, Prince Harry is a well-known public figure and philanthropist who has made significant contributions to a variety of causes throughout his life. While he and his brother Prince William have had some differences in the past, they remain close and supportive of one another, and they continue to work together on many charitable initiatives.