We all want to know so much and yet are cautious about what to ask so as to not put Jack in a compromising situation.
Jack, in the US, as you may already know well, we can, within reason and good manners, say pretty much what we want and
about what we want. We do not have censorship in the way that has been ingrained in Chinese culture, due to the politics of your past and present. So if we ask questions, or talk about issues that are uncomfortable for you, please just say you can't talk about that online.
I have to imagine the issue of birth control and population control is both very personal and also political.
No matter what, Jack you have two great kids and may they always be able to play in piles of leaves.
Actually, too soon, they grow up so fast, you can have them help you rake the leaves!