When Semisi Poumaama Liu was born about 1894, in Ovaka, Vava'u, Tonga, his father, Salesi Liu, was 36 and his mother, 'Eseta Vea Hihifo, was 25. He married Litia 'O Saione 'Evelini Tu'itupou about 1916, in Nuku'alofa, Tongatapu, Tonga. They were the parents of at least 1 son and 2 daughters. He died on 12 August 1965, in Manuka, Tongatapu, Tonga, at the age of 71, and was buried in Manuka, Tongatapu, Tonga.