Funny you bring up this topic in the way that you do. My kids are the opposite. They (like me) care very little about the holidays and traditions. They (like me) would rather stay home and play video games. But we still do traditional stuff for mom :)

But anyway, as to your original question. Wow, that is a multifaceted question with many answers. I'd argue that this question: "Why have kids?" is one of the most important questions facing advanced economies nowadays. It's also probably reveals one of the most ironic twists of fate brought about my modernism.