And quite a headache
![Big grin :D :D](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
Poor MC will live in her pickup driving up and down to get all the things the girls will be craving for.
I see you play the unpatched game, so to not mess things up I will answer for that version
1.- They have different parents not related to the MC and not important to the story (think about Truman's parents in the Truman Show)
2.- It's possible, but they aren't
3.- Mike and Dominic wanted to adopt them for scientific (and other) reasons. Mike, Dominic, and Anna are dead. It hasn't been said in-game, but the bodies were found.
4.- Eva and Amanda are future LIs. The unpatched version is prepared to have a foursome Erika/Daphne/Eva without Patreon complaining. I'm not saying it will happen. Only that it can happen.
5.- I won't spoil it. Their identity is 50% of the clones' arc.
2.- In both versions the age difference between clones and originals is around the same with the originals being around 3 months older (in the patched one Erika and Daphne are 4 months older than Eva because they were a bit premature).