I actually think without directly saying it, each of the above posts suggests that parents should have perhaps the most influence on whom their children ultimately end up with as a mate. Healthy families tend to share common values and expectations, including but not limited to religious values, perceptions of gender roles, communication methods, and identity/self-confidence.
Strong healthy families, as previous posts mention, are led by parents who build relationships with their children, role-model appropriate behavior, and impart expectations on their children in a way that is not burdensome (or overbearing) but not passive either.
Kids raised in such environments are more than likely going to be very highly influenced by the opinions and expectations of their entire family when it comes to the people they date or choose to marry. I know it was very important that my parents and siblings approved of the man I thought I wanted to marry. Had they not been, I would have certainly stopped and reconsidered.