Certain types of disputes can be litigated in Federal court, in addition to state court.

In general, disputes that deal with a federal topic, such as a federal government pension or a benefit governed by ERISA, may be litigated in federal court.  Disputes that concern only a probate matter may not be litigated in federal court.  Other inheritance disputes, such as litigation over a trust or a pay on death designation, may be litigated in federal court if there is federal jurisdiction.

For more information:

How to Litigate an Inheritance Dispute in Federal Court

Recent Federal Inheritance Litigation News