Air_if you legitimately have an underaged sibling and food is a question in your house you should look into getting government assistance.
i would need tax returns from legal guardians for government assistance of any kind, and we do not have access to those due to a really complicated and unfortunate circumstance (non U.S. located employer that did something illegal and then screwed all his employees over). so atm we're living quite below the poverty line without welfare or anything. my other sister recently fell off a lime scooter and knocked both her front teeth out and it was a huge trouble to scrape together enough money to convince a dentist that we could make the monthly payments.