InuTaisho II was the son of InuYasha and his wife, Katy. He was born only moments before his indentical twin brother, Sesshomaru II. Despite having inherited his father's looks, he does not have the doggy like ears of his father, rather having the slightly pointed ears likes his father's brother, Sesshomaru I. He was also the prince and heir to The Eastern Lands. He also had a younger sister named Izayoi, who was born a year after him and his twin brother, including inheriting the doggy like ears of their father, InuYasha.