This is easy. It takes 2 incomes to raise kids today -- that's baked into the government assumptions. The largest slice of single-parent households are almost automatically making below the median rate. There's your "relative poverty" right there in a nutshell.
But the goverment doesn't want to address economic & tax policies that have created the requirments for a 2-income household.
“But the goverment doesn’t want to address economic & tax policies that have created the requirments for a 2-income household.”
True and at the same time we have the claims made that somehow we are a much wealthier nation than in the days when a working class man could earn enough income for his wife to stay home and raise the children without having to have a job outside the home. We should be far wealthier but most of the wealth is squandered by government.