I’ve had long-term relationships with single parents and if you truly love the parent, you grow to love the child, too. I can’t imagine treating my partner’s child as “less than.” I certainly wouldn’t date someone who did. Like another poster mentioned, my sister and I were treated VERY differently growing up and it has had an effect on me my whole life. I’m still a stable, successful adult but I will always have some insecurities because of how I was treated. I hate to see other kids experience that.