You can avoid growing apart by focusing on growing together. This goes for any relationship – with your spouse, your kids, your parents, siblings, or friends. If you don’t do things with them, you will eventually lose touch. If you don’t keep in contact with them and reach out occasionally, you will be an afterthought to their current life. It’s not because you or the other person don’t like each other anymore, but growing and keeping a relationship strong takes work. If you don’t work at it, it will weaken over time.