What is a "family"? Should a business adjust the salary based on how many members you have in your family? If one person has 10 kids and another has 2 they have drastically different requirements. An only child with a well-off family might only be taking care of themselves whereas another child might need to also be taking care of their parents and grandparents who also need to pay for medicines in addition to taking care of their younger sibling who isn't old enough to work yet.

The variety and complexity of "enough to feed their families" is crazy.