Total BS. "Engaged" is the new expression for your shack up; it sounds more dignified. Having one child with a "fiance" I can understand; having eight is irresponsible. That doesn't explain the last two either.
What is she supposed to say? He gave her a ring and it wasn't finalized, although he stuck around long enough to father 8 kids. Why does everyone assume the last two aren't his? The first two could have been from a different father. JMJ, someone from this thread should demand DNA samples to clear this up!
Is your problem with the fact that they didn't get a state marriage license? Heck if you think about it, their relationship lasted longer than a lot of couples.