They are not in love with each others. Maybe my mom was at the start but I highly doubt my dad ever was.
My mom was looking for a master and my dad for a slave so they are perfect for each others. They had children because they felt they had to and if that is not their reason I know it is not because they wanted kids because otherwise at least they would of tried being parents.
For them they think they are good parents because one they cannot ever do no wrong and also because we always had food and a roof over our heads, they think that's the only job of parents.