I am looking for a lawyer to help my familyWe are in assistant in preparing a will for my grandmother

There is a "Find a Lawyer" tab on this website that can help you find an estate planning attorney for your grandmother.   A "Living Will" is a document that sets forth someone's preferences for end-of-life care.  A "Will" is a legal document that provides for how someone's assets should be handled and distributed upon their death.  If an heir of someone who has died believes that their relative's Will is not legal - for instance, the person who signed the Will had dementia to the extent that they could not have understood what they were signing - then they can contest that Will by bringing an legal action in probate court.  I hope this explanation helps.