Aberforth Dumbledore is the brother of Professor Albus Dumbledore.

From the Story

Harry Potter and the Goblet of Fire

Discovered in chapter 24, Rita Skeeter's Scoop

>According to his brother, Aberforth was prosecuted at one time for practising inappropriate charms on a goat. Despite the details being printed in the papers, Aberforth held his head high and went about his business as usual. Albus Dumbledore mentions that he is not entirely sure Aberforth can read, so his reaction may not have been down to bravery.