This is nothing new under the sun.
I was raised by a single mom, because, for those who don't know my history, my dad was married. To someone else. Thirty-some-odd years and 2 kids later, they're still together, although my dad has another family, other children, and IS MARRIED. It's not uncommon in Latin America for a man to have a "second family," but in the US, there's a bit of a stigma to it. However, I don't let it attach itself to me, because the decisions my mother made in her irresponsible youth as far as who would be a good father to her children were...well...her decisions. It's not my fault she didn't play it smart and protect herself - or that she messed around with a married man.
My dad, to his credit, gave her money, but it was not child support - it was mainly under the table, so to speak. He did not, however, give me or my brother much emotional support and he is paying for that now in at least one case (mine), because the emotional gulf between us is great. My mother doesn't understand it and holds it against me, but again, I refuse to pay for the sins of my parents. I love my mother and goodness knows I would lay down my life for her, but I wouldn't grieve overmuch if my dad were lying in the gutter bleeding, because he could never be bothered to be there for me when it counted. And when it came to material things - forget it. His "real" kids got the best of everything, cars, private educations, name-brand clothes, you name it. We weren't dirt-poor, but my brother and I certainly didn't live in the lap of luxury, either.
My mom collected welfare for us until I was about nine - and then that was when they really got into tracking down the fathers of children on welfare (in CA) so they could slap them with support enforcement orders. Well - it was discovered after all those years my dad had never paid a dime of state child support, so it was either - pony up and pay it until the kids turn 18, or we put a lien on your house and make you pay back all the state assistance your kids got. My father chose the latter option, because he felt he was already supporting us "enough." My mom went into the workforce, but chose not to work full-time so as not to take more time from us than she needed to.
So...I should be grateful, I suppose, that he grudgingly paid back what he should have been paying for all those years. I should be grateful that I had to work my way through college and get scholarships, grants and loans, because my mom's income definitely didn't cover things like college - it barely covered the necessities.
Actually, I am grateful - because it showed me, as a woman, how not to choose a life partner. I'm still holding out for someone who is honorable, faithful and who respects me and my strength, not someone who can control me and manipulate me and abuse me emotionally as my father has done to my mother - and has even attempted to do to me.