Ex-U.S. President George H.W. Bush has shaved his head to make a 2-year-old boy feel better. The boy, Patrick, is the son one Mr Bush's bodyguards. The little boy has a blood disease called leukemia. When people have treatment leukemia, all their hair falls . Bush said he wanted to help Patrick. Mr Bush's friend said the former president, 89, now looks the same as Patrick. He said: "It's hard to tell them apart." Mr Bush, and his wife Barbara, also made a donation to help pay Patrick’s medical bills. There is also a special website Patrick where people can give money his expensive treatment. The website was set Mr Bush's other bodyguards. They also shaved their head. Mr And Mrs Bush lost their second child, a daughter, to leukemia 60 years ago. The little girl, named Robin, was just four years old. They worked hard many years after to raise money leukemia research. A special clinic called the Robin Bush Child and Adolescent Clinic opened a hospital in Houston, Texas 2004. Leukemia is a kind cancer the blood. It used to kill many people, but nowadays those the disease can get treatment hospital. It is a lot easier to cure children than adults. Anyone, any age, can get leukemia. Wikipedia says that in the year 2000, around "256,000 children and adults the world developed some form of leukemia, and 209,000 died it".