My aunt was devoted to John Doe for over 23 years assisting him in his household, and helping to care for his handicapped brother, who passed 3 yrs. ago. My aunt was mentioned to receive many proceeds in John Doe's Will.. Now, John Doe recently passed. He had Alzheimer's Disease.My aunt's only sister and next of kin is living, and if my aunt were here, she would want her to benefit . Now strange things are happening that are not just. A codicil was attached revoking my aunt, since she is no longer living. Everything is questionable on this will, from validity to signatures. The living sister is concerned because John Doe talked to her everyday since my aunt's passing, stating that my aunt 's name is on the will, as well as the living sister. Can all of this be challenged.?