Takanaka had an older brother whose name was Shigemoto NIWATA and a younger sister who was Tsuguko NIWATA (serving as the Emperor Ninko's 'naishi no suke' which was an assistant handmaid in the Kokyu palace which was the imperial harem including the empress's residence; and an 'O-oku joro kamiza' which was a top ranking upper-grade lady-in-waiting at the O-oku [literally, the great interior, which was the women's quarters in Edo Castle and was the shogun's harem])
兄に庭田重基、妹に庭田嗣子（仁孝天皇典侍・大奥上臈上座）らがいた。