Just 'cause ya got a beamer don't mean you ain't white trash.
(Bryan's wonky eye is telling me his mom might be his sister.)
I'm wondering if perhaps we're being a little too judgmental of the Vannoys. Maybe they're just part of the "free range kid" movement. Sure, most of those folks wait until their kids are somewhat older and more cognitive before they start letting them explore the world without parental hovering, but at four months how much trouble can a kid get into anyway?
As long as the car door was locked, what's the problem?