I only remember certain scenes of this movie
I remember the woman got a male nanny to look after you kid, he wanted them to be his family and started causing problems between husband and wife.

Maybe The Stranger Game?
Moria - The science fiction, horror and fantasy movie review site - Stranger Game, The (http://www.moria.co.nz/index.php?option=com_content&task=view&id=3548Itemid=1)

Yes yes yes thank you

You're welcome.