Sumiyoshi sanjin
According to Japanese mythology as written in works such as the Kojiki and Nihon Shoki , the Sumiyoshi sanjin were born together with the Watatsumi Sanjin ( 綿津見三神 ) when Izanagi performed a purification ceremony after returning from Yomi . 
<triplet> Watatsumi <subj> Izanagi <obj> father <triplet> Izanagi <subj> Sumiyoshi sanjin <obj> child <subj> Watatsumi <obj> child