The question of whether or not Voldemort and Dumbledore are brothers is a popular one among fans of the Harry Potter series. However, there is no evidence within the books or other official sources to suggest that they are related in any way.
Firstly, there is no mention of any familial relationship between the two characters in the books. Voldemort, whose real name is Tom Marvolo Riddle, is the son of Merope Gaunt and an unknown father, while Dumbledore’s parents are Percival and Kendra Dumbledore. There is no mention of any connection between the two families in the books, nor is there any indication that Dumbledore and Voldemort might be related.
Secondly, the characters themselves do not exhibit any traits that would suggest they are brothers. Dumbledore is kind, wise, and compassionate, while Voldemort is cruel, power-hungry, and evil. The two characters are also quite different in appearance, with Dumbledore being tall and thin with long silver hair and a long beard, while Voldemort is described as being tall and thin with pale skin and dark hair.
Thirdly, the age difference between the two characters also suggests that they are not brothers. Dumbledore is much older than Voldemort, with the books indicating that he was born in 1881 while Voldemort was born in 1926. This means that there is a 45 year age difference between the two characters, making it highly unlikely that they could be brothers.
Fourthly, the personalities and motivations of the two characters also do not align with what one would expect from brothers. Dumbledore is a powerful wizard who uses his abilities to protect others and promote good, while Voldemort is a dark wizard who seeks to gain power and dominate others. These differences in character and motivation make it unlikely that they would be brothers.
Finally, there is no evidence in the books to suggest that Dumbledore and Voldemort are brothers. While it is certainly possible that J.K. Rowling, the author of the Harry Potter series, could reveal that the two characters are related in some way in the future, for now it seems unlikely based on the information available. In conclusion, it is safe to say that Dumbledore and Voldemort are not brothers.