In 1563, Harumitsu ISHIKAWA, the twenty-fifth head of the family, adopted Kojiro (later, he was renamed Akimitsu ISHIKAWA), the fourth son of Harumune DATE and handed over the head of the family to him and retired.
第25代石川晴光は、永禄6年（1563年）、伊達晴宗の四男小二郎（後に石川昭光と改名）を養子に受け、家督を譲って隠居した。