Anyone who could potentially be an heir or a beneficiary of an estate is eligible to contest a will. You usually hire an attorney and go in front of a judge to probate the will, so it’s pretty easy for one of the unhappy heirs to just show up to court and start causing problems. I had one probate case where a woman showed up to the probate hearing and claimed to be the common-law spouse. She didn’t have to spend a dime, and she wound up costing the family thousands in added legal fees and months of delays because we had to prove that she did not meet the legal standards of a common-law wife.