i'll say this - if i wanted kids, i wouldn't care whose kids they were.
as i don't want anything to do with kids in a parental role, i wouldn't date someone who had them, unless it was understood that there would be no *long-term* future. there's nothing wrong with enjoying one another's company for a time, but when two people's life goals are so diametrically opposed, there's really no sense in starting a relationship. (unless, as i said, it's discussed and well understood beforehand.)