“Yes. If the ex-spouse created a will that named your children as beneficiaries of her estate while they were married to you, they can always create a new will or amend the existing one to remove your children as beneficiaries.
It’s important to keep in mind there is no such thing as a limit to how many times a will can be changed. In fact, it’s generally recommended for people to update their wills every few years to reflect life changes such as marriages or the birth of a child.”