These types of legal proceedings can be expensive as they usually involve Supreme Court litigation. The costs involved in bringing a family provision application will depend upon:
The issues you choose to pursue
The extent you wish to instruct your lawyers to pursue the issues
The conduct of all parties to the litigation.
The actual costs incurred can be affected by your instructions and the conduct of the executors defending the estate. The greater amount of cooperation you receive from the executors of the estate will result in less fees overall.