I think it's definitely worth making a call over. I would always err on the side of calling for something that's no big deal, rather than potentially ignoring something very serious. At the very least, if things get worse there'll be a paper trail showing that CPS has been called before. What a shitty situation, those poor kids. And to think that there are wonderful, kind people out there who are unable to have kids, and these douchebags are blessed with two?

"You know what? I'm growing a person.  If I want to eat this Big Mac and then eat another you will have nothing to say about it.  As a matter of fact, if you try and keep and keep me from my Big Mac and his step-brother, the refreshing and delicious fountain Coke, I will turn into the Incredible Hulk except with pregnancy hormones, and I will rip off the arms you used to steal my cheeseburger."