What is the name of Albus Dumbledore's brother who was sentenced to Azkaban for attacking Muggles?
Aberforth Dumbledore
<s>[INST] <<SYS>> Answer as briefly as you can to the following question. You are required to give a one-shot answer: <</SYS>> What is the name of Albus Dumbledore's brother who was sentenced to Azkaban for attacking Muggles? [/INST] Aberforth Dumbledore </s>