Estate planning is intended to prevent disputes from arising after your death. Of course, good intentions aren’t always enough. Even the most carefully planned estate may be subject to fighting among aggrieved relatives or other would-be heirs. In some cases, these fights can tie up the courts (and your estate) for many years.
For the most part, when lawsuits do arise over a trust or estate, things are handled at the state level. In California, the superior courts act as probate courts to resolve matters like will contests or petitions to remove a trustee. The decisions from these courts may then be appealed to the California Court of Appeals, and, in rare instances, to the California Supreme Court.
Federal courts generally stay away from probate matters. As far back as 1789, when Congress created the federal courts, the probate of estates was considered a purely state affair. But this probate exception to federal jurisdiction is not without limits. In 2006, the U.S. Supreme Court said federal courts could hear cases that touched upon probate matters if the underlying dispute involved a subject (such as tort law) that was normally subject to federal jurisdiction.