Hm, how about replacing the fake younger sister with one instead? Nab the one from the episode I referenced earlier, about the human woman turned into one or Dalek insane enough to think it was once a human woman (Not sure which, I've only seen clips on YouTube) just before her heroic self-sacrifice. Integra might like her enough to make the adoption formal after getting the rest of the plot straightened out... that was one of the more bewildering and disconnected plots, and may have been invented for the TV showcome to think of it. It certainly made no more sense than typical anime filler episodes.
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"Anko, what you do in your free time is your own choice. Use it wisely. And if you do not use it wisely, make sure you thoroughly enjoy whatever unwise thing you are doing." - HymnOfRagnorok as Orochimaru at SpaceBattles
woot Med. Eng., verb, 1st & 3rd pers. prsnt. sg. know, knows
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"Anko, what you do in your free time is your own choice. Use it wisely. And if you do not use it wisely, make sure you thoroughly enjoy whatever unwise thing you are doing." - HymnOfRagnorok as Orochimaru at SpaceBattles
woot Med. Eng., verb, 1st & 3rd pers. prsnt. sg. know, knows