Yes. And your heart goes out to his surviving sister too, who knows what that child's been through
It's easy to rush to judgement on the apparent non-involvement of agencies like social services and the school here. It might be better to wait for the serious case review findings particularly when Mrs Justice Cox specifically commented:
//Both of you constructed a careful and wholly untruthful account that Daniel had a serious eating disorder and learning difficulties, which he may have inherited and for which he was receiving medical treatment. This account was deliberately designed to prevent interference by school, medical and welfare personnel, and to perpetuate the brutality being meted out to him. You instructed and encouraged Daniel's older sister to tell lies to the authorities if she were asked any questions about what was happening at home.//
Full sentencing remarks are here
http://www.telegraph.co.uk/news/uknews/crime/10218843/Daniel-Pelka-deeply-shocking-and-disturbing-judge-sentencing-remarks-in-full.html