In 991, his younger brother, Shigenobu, was appointed to Udaijin and brothers, Masanobu and Shigenobu, worked as ministers of the right and left, until the year in which Masanobu died.
正暦2年（991年）、弟の重信は右大臣に就任し、雅信が没する年まで兄弟で左右大臣を務めている。