So that sucks, but I just don’t see it being entirely about poverty in this case. There’s not a single neighbor of theirs who they could ask “hey, next time you drive to Walmart let me ride with you”? They hit their diet to save money? There’s no churches around them doing food pantry days?
Scurvy… You can prevent scurvy by eating literally anything uncooked, including meat. You can get vitamin C from grass. Sounds to me like these people are wholly uninterested in understanding anything about nutrition and diet and don’t talk to their neighbors at all.