Answer
Ninigi, a celestial deity, is Emperor Jimmu's paternal grandfather according to Japanese mythology. Jimmu, the legendary first emperor of Japan, is believed to have descended from the gods. Ninigi's father, Takamimusubi, is considered the supreme deity in Japanese mythology, while his mother, Amaterasu, is the goddess of the sun. Ninigi's grandson, Jimmu, is said to have founded the Japanese imperial line, which has continued to the present day.