-SPOILER- Do yourself a favor and skip this movie
There's a lot of complaints about the scenes with the children ... which wasn't the problem for me with this movie ... there's enough plausible deniability to get by that.
The real disturbing bit is twofold,
1 - the writing works too hard to get the viewer to the point of sexual tension between mom and clone-boy, leaving believability long behind. There's nothing believable or natural about it, the scene with the fishing net is contrived and unbelievable (for him from a human nature behavioral pov),
2 - he has sex with his mother near the end of the movie, and that's pretty much it.
So the logical conclusion is not that the writers wanted to deal with incest from a clinical or socially relevant pov, but simply for the sake of presenting it either for shock and or to appeal to whoever would find this interesting outside of those parameters.
Even if a clone that close was possible, which it isn't for a host of reasons ... there's no reason to believe he would have some attraction to her due to the identical genetics of the original.
The yuck factor is strong with this one.