I'm just doing a reread of Tiny Habits by BJ Fogg (one of the OG researchers on the topic). It's really good, and I'm already thinking of dozens of ways to apply this to myself and my kids. (He presents his framework as a model for human behavior, not just what we normally think of as habits.)

I think the key with any kind of self-help advice or book is that you have to study it, not just read it. I plan to be working with this book for at least the next six months. I read too many other "inspirational" books that didn't have a lasting impact; the first read is just research to decide whether it's worth devoting time to. Then the real work begins.