标题:402,403 双生児による人格形成の研究(II) : 双生児の自主的傾向の発達(9.家族関係,日本教育心理学会第5回総会部門別研究発表要旨・討論の概要) [in Japanese] 402,403 A study of personality formation through the twin research II : Development of psychological independence of adolescent twins(9.Family relationships, PROCEEDINGS OF THE FIFTH ANNUAL CONVENTION OF JAPANESE ASSOCIATION OF EDUCATIONAL PSYCHOLOGY PAPERS AND THE SUMMARIES OF DISCUSSIONS) [in Japanese]