Board Thread:Questions and Answers/@comment-79.101.242.202-20151210170326/@comment-25942629-20151220022842

Not unless they do an ova or something, and it would not be cannon in that case. I don't think I've seen the entire Hiragi family together in the manga or in any of the novels. They exclude Shinoa, Mahiru is betraying people left and right, Shinya is adopted and despised, and Tenri is sick and does not get out much these days. They have a big, unhappy family. I don't know if any of their mothers are still alive, but it seems highly unlikely that Tenri held any affection for them.