It has been pointed out that another mound to the south of the Karausuyama-kofun burial mound belongs to Imoko's father, and a preliminary survey was conducted by the Otsu City Board of Education, but the mound was found to have been destroyed beyond repair.
唐臼山古墳南方の古墳は妹子の父の墓である可能性が指摘されており、大津市教育委員会による事前調査が行われたものの破壊され現存しない。