Genealogy
Before Go-Sai's ascension to the Chrysanthemum Throne, his personal name (imina) was Nagahito (良仁?) or Yoshihito; and his pre-accession title was Hide-no-miya (秀宮?) or Momozono-no-miya.
He was the eighth son of Emperor Go-Mizunoo. He was raised as if he were the son of Tōfuku-mon'in. Former Empress Meishō was his elder sister by a different mother; and former Emperor Go-Kōmyō was his older brother by a different mother.
Emperor Go-Sai's Imperial family lived with him in the Dairi of the Heian Palace. This family included at least 11 sons and 17 daughters, none of whom would ascend to the throne.
- Court lady: Princess Akiko (明子女王) – first daughter of Imperial Prince Takamatsu-no-miya Yoshihito (高松宮好仁親王)
- First daughter: Imperial Princess Tomoko (誠子内親王)
- First son: Imperial Prince Hachijō-no-miya Osahito (八条宮長仁親王) – fourth Hachijō-no-miya
- Lady-in-waiting Seikanji Tomoko (清閑寺共子)
- Second son: Imperial Prince Arisugawa-no-miya Yukihito (有栖川宮幸仁親王) – 3rd Arisugawa-no-miya
- Second daughter: Ni-no-miya (女二宮)
- Third daughter: Princess Sōei (宗栄女王)
- Fourth daughter: Princess Sonsyū (尊秀女王)
- Fourth son: Prince Yoshinobu (義延法親王) (Buddhist Priest)
- Sixth daughter: Enkōin-no-miya (円光院宮)
- Fifth son: Prince Tenshin (天真法親王) (Buddhist Priest)
- Seventh daughter: Kaya-no-miya (賀陽宮)
- Tenth daughter: Imperial Princess Mashiko (益子内親王)
- Eleventh daughter: Princess Rihō (理豊女王)
- Thirteenth daughter: Princess Zuikō (瑞光女王)
- Consort: Daughter of Iwakura ?? (岩倉具起)
- Third son: Prince ?? (永悟法親王) (Buddhist Priest)
- Consort: Daughter of Tominokōji Yorinao (富小路頼直)
- Fifth daughter: Tsune-no-miya (常宮)
- Consort: Umenokōji Sadako (梅小路定子)
- Eighth daughter: Kaku-no-miya (香久宮)
- Ninth daughter: Princess Syō'an (聖安女王)
- Sixth son: Prince Gōben (公弁法親王) (Buddhist Priest)
- Seventh son: Imperial Prince Dōyū (道祐法親王)
- Eighth son: Imperial Prince Hachijō-no-miya Naohito (八条宮尚仁親王) – fifth Hachijō-no-miya
- Eleventh daughter: Princess Rihō (理豊女王)
- Twelfth daughter: Mitsu-no-miya (満宮)
- Fourteenth daughter: Princess Sonkō (尊杲女王)
- Fifteenth daughter: Princess Sonsyō (尊勝女王)
- Eleventh son: Prince Ryō'ou (良応法親王) (Buddhist Priest)
- Consort: Daughter of Takatsuji Toyonaga
- Ninth son: ?? (道尊法親王) (Buddhist Priest)
- Consort: Daughter of Matsuki ?? (松木宗条)
- Tenth son
- Consort: Unknown
- Sixteenth daughter: ?? (涼月院)
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