user: Question: What is Median Family Income, when Median Household Income is "$50,717"?
Columns: ['County', 'Per capita income', 'Median household income', 'Median family income', 'Population', 'Number of households']
Types: ['text', 'text', 'text', 'text', 'real', 'real']
Sample row: ['Fulton', '$37,211', '$56,709', '$75,579', 920581.0, 376377.0]
SQL:

assistant: SELECT "Median family income" FROM "Table" WHERE "Median household income" = '$50,717';