MIGHT BE SPOILER. AAll the talk of who's who and clones.Here is my theory, MC's dad cloned him with no memory of his mother and let him go to his mother to get her off his back about what he was doing.She (Ana) knew what the dad was doing so she killed the MC as she didn't want her son to suffer (humming a tune as he died). Electra in the bar scene stated he died in my arms.MC doesn't recognize her do to what he went through or as she put it most of what you see isn't real. So he wasn't able to recognize her as Samantha his mother. That's right I think Samantha,Ana and Electra are the same person. Ana and Electra(Samantha) look a lot alike same facial features, hair style and length. People come back from U4IA a different person. Does his dad have another lab on the island that he keeps the people for his use after sending clone back or vise versa. As for the accident she survived some how or it was a cover so she could start a new life.After all that's what this Island seems to be about. Just my feeling as I played it 4 different routes.Electra (Samantha) I'm sure is MC's mother.The ring he has that belonged to her will tie them together.The girl on the phone at end being told to sing the song to him is talking to Samanatha (Electra)