[Flashpoint]

The lack of lunch and clothing is likely symptomatic of a larger problem. Drug addiction, neglect, abuse.

Giving him warm clothing and food is treating the symptom. You have to treat the disease. Regrettably, social services should be notified, as it's probably the only way to actually prevent a child from freezing and starving for months to come.

Good on your family for both noticing, and trying to help.