It is said that this was because Tameie was concerned about the future his son, conceived when Tameie was in his sixties, would have, but in any case the Nijo and Reizei families entered into a long-running dispute concerning dominion over his territories and ownership of the Izayoi Nikki (Diary of the Night of the Sixteenth).
これは、為家が自分が60歳代になってからの子であった為相の行く末を案じたためであると言われているが、所領十六夜日記の所有権に関しては、冷泉家と二条家の間で長らく争論があった。