To everyone that's surprised they finally see Len, a boy, in the Afterglow song cover:
Ran's father, noticeably another male, does appear in a band story, if you never noticed.
thisajokedontgetoffended
edit: Seems I forgot Yukina's dad. And sorry to be saying this now, but my disqus is such a tsundere. Thus, (did I even use that in the appropriate place) I can't reply to your comments through disqus, so please do not mind.