Gift deed

You are not asking help but asking someone to be partner in crime.  How?  I will explain.  However old a person is, if that person has some property in her name, she would want to pass it on to the person whom she likes it to have.  In this case I dont think the old lady wants to transfer the property just to your wife who is her grand daughter..  There are also others whom she wants it to have a share in it.  You want to coerce her will.  That is illegal and  not moral and is unethical.  Will of a person should not be known to other members in the family during his or her life time.  Only after his or her life time ones will is to be made know.  What you are proposing old lady to do is distribution.  Please dont do that is my advice to you.  Anyways if she makes a will in your wifes name, still others can file case in court of law amd make you roam to court till you die.