These things happen, and if your Will is high risk there may be family members or beneficiaries who challenge a Will.
Be sure to prepare adequate documentation in your Will as part of your estate planning, any documentation or supporting information can help if a claim is brought forward and will ensure your Will is carried out in line with your wishes.
If a dispute does arise, your executor will play a role in managing it.
If you are concerned about beneficiaries or individuals disputing your Will is it important to reduce the likelihood of a challenge by restructuring your assets or leaving a small gift to an individual who is likely to contest your Will.