I suspect it's the former, but it doesn't seem outrageous (like all "common sense"). I think the hard part is to replicate the parts one's parents did right. Like IT, when someone gets things right, they're invisible. When they get things wrong, it seems like the only thing they ever did. This is part of why I want my children's grandparents involved as much as possible in their life. I need to \alpha \times \grandparents + (1 - \alpha) \times \parents my kids.