[Tommovie]

Years ago I saw a movie that I would like to see again, but I can't remember the title.
In fact, I can only remember one scene. It's not much to go on, but maybe it rings a bell.
It's a movie from the sixties.
A bunch of villains have moved in to a detached house, pretending to be a family, but in fact they're preparing a crime (a heist or a kidnapping, I really can't remember).
The house lies in a isolated place, rural perhaps, and there's just one house next to it where a family lives who doesn't know anything about the real identity of their new neighbours.

[kristinebrewer]

Is that something to do with kids? If it does not, don't count me for your best answers.

[Tommovie]

The family next to the villains had kids. I remember a boy playing in the yard while the villains where observing their neighbours. I can't remember if the boy played a significant part in the movie though.