Working Families

There is a lot of discussion about extending GWBush's tax cuts in Congress. I often hear news people and politicians using the word "working families". Mostly they say "working families" need money in their pockets to feed their kids, pay mortgage and buy clothes, etc. Therefore, as the logic goes, we should extend the cuts for the "working families" but not the "rich". The rich here is families making more than $250k a year.

Here's my question. Are rich families not working? Do they just get money somehow but not via our standard definition of work? If they do in fact have to work to get the $250k, then why aren't they considered "working families" and get the tax cuts too?