Hiromoto's fourth son, Suemitsu MORI was conferred a peerage as Junior Fifth Rank, Lower Grade at the age of 16 in 1216, and became a member of Council of State at the age of 32 according to the article "Azuma Kagami"on November 3, 1233.
四男・毛利季光は16歳の1216年（健保4）に従五位下に叙爵、32歳のとき『吾妻鏡』1233年（天福元）11月3日条に評定衆とある。