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1) Ange is confirmed as a family member in episode 1. (by Eva, Hideyoshi and Kyrie).
2) I'm pretty sure the whole stuff is about those who are qualified to be the head: as shown in episode 3 and 4, Ange is, as the last survivor of the Ushiromiya family. However, the whole point was "right here, right now". On rokkenjima at the very moment, Ange is nowhere and arguably the least possible candidate, not only for the absence, but also due to the age.
Furthermore, if you think about it, Ange is the daughter born from a second marriage, which might be a problem to mention, considering how Kinzo is VERY old fashioned.
Finally, it isn't a mystery: more facts are stated around the end of Episode 4 so.
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