[Well, in the lack of immediate offers of bribery in exchange for not sending the photo, send! But it's amazing how a simple question, three small words, can chase all amusement from his eyes and replace it with something hard.]

She knows her mother was murdered, that I was the assassin, and that you're the one who ordered her death. She knows she's someone significant to me, but not that we're related.

[He isn't sure what detail Shido's asking about, but he doesn't see any reason not to answer both possible interpretations. Let Shido know Futaba is aware of half the reason to hate him.]