Wiktionary
working family
n. A family in the working class.
Wikipedia
Working family
Working family was a term used by Kevin Rudd, former Prime Minister of Australia, and members of his leadership team, during the lead-up to the Australian federal election, 2007.
Usage examples of "working family".
Not that they were breaking the law in any way, simply that they were industriously creating a continental holiday out of an ordinary working family's holiday-camp vacation, a confidence trick purely to cement the status which they were determined to hold on to.