This is a royal family from a hellish dimension.
Asuraman is raised to be a strong akuma chojin by his parents, enough that it infuriates them when he strives to become a Seigi Chojin, and later marries an unnamed woman, who gives birth to his son in Kinnikuman Nisei. The son grows to be evil, killing the mother, due to their genetics being so strongly predisposed to evil deeds and desires. We see several generations of this family over all three main series.
(More to Come)