Most people put off estate planning. In fact, most people don't have a will.
Here's what people assume, based on the traditional model, is going to happen when someone does their estate planning: They'll pay off the mortgage, retire, live in the home without payments until they pass away and then leave the home to their heirs debt-free.
If you're thinking about putting money in a trust fund for your children, you probably want to control how you give it to them. For instance, maybe the trust will set it aside for educational costs or maybe it will pay out when they hit a certain age.