Wife •
Princess Consort Sangsan of the Sangju Kim clan (상산군부인 상주 김씨, 26 June 1698 – 12 June 1725): Her maternal grandfather was Yi Pyo, Prince Imwon (임원군 이표, 1654–1724), a great-great-grandson of King
Seonjo of Joseon.
Issue Prince Yeollyeong died without issue; as such, Yi Sang-dae, the second son of Prince Milpung (Prince Yeollyeong's third cousin) was chosen to be his heir in 1719 and given a new name Yi Gong () in 1727. • Adopted son (annulled): Yi Gong, Prince Sangwon (상원군 이공, 1715–1733), a great-great-grandson of
Crown Prince Sohyeon. He had no issue; as Prince Milpung was involved in the
Musin Revolt, the adoption relationship was posthumously annulled in 1733. • Adopted son (annulled):
Yi On, Prince Nakcheon (1720–1737), a 4-great-grandson of Prince Gyeongchang (9th son of King
Seonjo) and the only son of Yi Chae (); appointed to be the heir to Prince Yeollyeong in 1734. He had no issue; the adoption relationship was posthumously annulled during the reign of King
Jeongjo. • Adopted grandson (annulled): Yi Yeong, Prince Dalseon (1731–1749), a 6-great-grandson of
Deokheung Daewongun (7th son of King
Jungjong) and the second son of Yi Hyeong-jong. He committed suicide after being abused by his adoptive mother, Lady Seo, the wife of Prince Nakcheon; therefore, the adoption relationship was posthumously annulled in 1750. He married Lady Sin (1730–1786) of the Geochang Sin clan but they had no issue; his nephew Yi Min-sik (이민식, 1753–1817; grandson of Yi Hyeong-jong) was appointed to be his heir. but not as his "adopted grandson" or "adopted son" of Prince Nakcheon. ==References==