Literally one of the worst movies I've ever watched.
Minor spoilers ahead...
The premise had potential (a duplicate version of each person, being 'tethered' to their counterpart), but that's it.
The acting was awful, the plot aspects we're expected to accept - a hit to the father's knee renders him unable to do anything but feebley and slowly crawl away from his approaching tormentor, rather than just stand up and hop away, for example.
I could go on but that would mean putting more effort into this review than was put into making this film, so instead I'll just humbly suggest: watch something (anything) else.