Sorry, T. You've got your numbers wrong. According to this census chart, the median income of all households in the U.S was $50,303 in 2008. Only 24.7% make under $25k. Roughly 70% make between $25k and $250k. There is no way the median for the bottom 95% is $17k. You can't calculate it from this chart, but based on the numbers in it, the median for the bottom 95% has to be around $40k. Notice that the last group is "over $100k". You have to get up to the $200k range to hit the top 5%, so many in that last group still fall in the bottom 95%. Also, notice in the last chart - median in constant dollars, that the median income is up over $6000 since 1980. So much for the falsehood that incomes have slid in constant dollars over the years.
I meant single income household, which is where single parents tend to fall, no?