Lies My Babysitter Told (1970)

When new mom Carnie wants to go back to work, she hires the neighbor’s son Matt as childcare much to the reluctance of her husband Nick. Yet as Matt inveigles himself into their lives, it seems he has an insurmountable obsession with Carnie making her uncomfortable and on edge. Yet it’s Nick that Matt has history with and the secret is about to come out.