<P> After repeated attempts to reach Derek on his phone , Sharon finds Derek at the hospital and suspects that he and Lisa had an affair , as Lisa claims . LAPD Detective Monica Reese ( Christine Lahti ) at first questions Derek 's fidelity to Sharon as well , but soon becomes skeptical of Lisa 's claims , due to inconsistencies in her story . Sharon , refusing to believe Derek , kicks him out of their house , and he moves into a separate apartment . Months later , Derek and Sharon meet up for dinner and finally reconcile . Meanwhile , Lisa tricks the babysitter Samantha ( Scout Taylor - Compton ) into letting her in under the pretense of being one of Sharon 's friends . When Derek and Sharon return home after dinner , they discover that Lisa had been in the house and seemingly abducted Derek and Sharon 's infant son , Kyle ( Nathan and Nicolas Myers ) . Derek goes to his car with the intent to pursue Lisa , only to find the baby is safely sitting in the back seat . He and Sharon immediately take Kyle to the hospital for a check - up . When Derek and Sharon return home from the hospital , they find Lisa has trashed their bedroom and removed Sharon 's face from their family portrait . Sharon leaves a threatening voice message on Lisa 's phone , and she and Derek set up a home alarm system . </P>
<P> After repeated attempts to reach Derek on his phone , Sharon finds Derek at the hospital and suspects that he and Lisa had an affair , as Lisa claims . LAPD Detective Monica Reese ( Christine Lahti ) at first questions Derek 's fidelity to Sharon as well , but soon becomes skeptical of Lisa 's claims , due to inconsistencies in her story . Sharon , refusing to believe Derek , kicks him out of their house , and he moves into a separate apartment . Months later , Derek and Sharon meet up for dinner and finally reconcile . Meanwhile , Lisa tricks the babysitter Samantha ( Scout Taylor - Compton ) into letting her in under the pretense of being one of Sharon 's friends . When Derek and Sharon return home after dinner , they discover that Lisa had been in the house and seemingly abducted Derek and Sharon 's infant son , Kyle ( Nathan and Nicolas Myers ) . Derek goes to his car with the intent to pursue Lisa , only to find the baby is safely sitting in the back seat . He and Sharon immediately take Kyle to the hospital for a check - up . When Derek and Sharon return home from the hospital , they find Lisa has trashed their bedroom and removed Sharon 's face from their family portrait . Sharon leaves a threatening voice message on Lisa 's phone , and she and Derek set up a home alarm system . </P>
who is the baby in the movie obsessed
who is the baby in the movie obsessed
Nathan and Nicolas Myers
Nathan and Nicolas Myers