Sewashi's father is the father of Sewashi, the original owner of Doraemon. Nobita and Shizuka's great-grandson is most probably a son of Nobita's grandson. He appears in the series only once. He and his wife initially did not want Doraemon to be with them but because of his son, Sewashi, who was a baby at that time and wanted to be with Doraemon, Doraemon was selected. He looks the same as Sewashi, but with spikes and long hair from back. He strongly dislikes Nobita, as he's a very poor student, just opposite of his great grandson.