From the “Little I know”: It [joy] must be modeled. However, our modeling, if only an act, will fail on contact. It is our own emotional involvement in Torah and Mitzvos that must be 100% real. If we allow our children to witness treating davening as a chore, or being disrespectful of it by behaving in shul in ways that we shouldn’t, that will be what they learn.
Me: Obviously you are right. But — there are homes where this is evident yet kids, for whatever reason, are not interested. Kids make decisions for various reasons. In my (not immediate family), a relative left observance at a young age because he wasnt interested. He is a great relationship with his parents, has a college degree and a profession. His parents wish he was observant — and he is aware of that — but other than that nothing much to do.