Don't fucking bet on it. Nobody is gonna intervene. He is gonna grow up to be a miserable fat bastard and, as you said, his parents will not take the blame at all, if he even ends up blaming them for it. I say this as someone who went through it, who was obese through my younger years and who ended up losing ALL of the weight + extra as soon as I became 18. I am a huge minority, however, yet I still cannot forgive my parents. My early years fucking sucked ass and everything would have been great if I was fit at that age. My dad is fat as fuck. My grandma is fat as fuck. My mom isn't fat but she damn should be, I have zero clue how she isn't obese. I hate them all with a fucking passion, I honestly cannot believe someone would do such a thing to a fucking kid. I was fucking lucky for waking up when I did, most people who go through that shit stay fat for life.