A trust gives you greater protection than a will against legal action from anyone who is unhappy with the distribution of assets and decides to challenge it. This benefit alone may make some people consider a trust a good option. However, the fact that a trust is difficult to contest doesn't mean it is impossible. There are two main ways to challenge the legitimacy of a trust. The complainant can claim that the grantor was mentally incapacitated when setting up the trust -- essentially, that the grantor didn't have the ability to fully understand the responsibilities, risks, benefits and other aspects of setting up the trust. And a trust can also be contested on the grounds that the grantor was under duress or "undue influence" when setting up the trust -- and didn't do so freely. But a trust is still more difficult to contest that a will.