Manten

 Manten is the youngest of the Thunder Brothers. He is a quite ugly demon with a large bald head. He is envious of his brothers hair, and believes that he would attract more women if he had the same. He is not as powerful as his brother Hiten, but he can also shoot flames from his mouth. Manten once kidnapped Kagome, intending to create a hair growth potion from her skin. He is killed when Inuyasha throws Tessaiga towards him.

RELATIONSHIPS
hiten: hiten is seen as mantens older brother. it is seen as the brothers had a somewhat caring relationship after manten being stabbed by hiten pleading with him to stay alive.

soten:mantens younger sister it is unclear what kind of relationship they had as soten was not introduced till after manten and hitens deaths.