Godsend (2004)

After Paul Duncan (Greg Kinnear) and his wife, Jessie (Rebecca Romijn-Stamos), lose their young son, Adam (Cameron Bright), in an accident, they are approached by Richard Wells (Robert De Niro), a fertility doctor. Wells believes that he can clone Adam and gives Paul and Jessie the option to let him try, but only if they start life over elsewhere. Adam's clone proves to be identical to the deceased boy, but, when he reaches his 8th birthday, things begin to go horribly wrong.