65 year old mother with some memory and dementia problems is in the care daughter only by vulture of the fact that the elder person lives in a house owned by the daughter. There is no guardianship or conservator involved. Daughter is using this living arrangement to deny full access to the elder person by screening calls, intercepting mail, covertly preventing elder person from answering the phone, and openly and blatantly attempting to turn the affections of this mother against one or more of her sons. Yes, there is a sibling rivalry, and the daughter is using the mother, at the mother's emotional, psychological, and possibly physical health to boost her own ego. Phone calls to this mother's private phone line go unanswered, and it is only by calling the daughters phone will you be able to talk to the elder IF the daughter deems you worthy, and are not a friend of, or otherwise associated with, the brother she despises so much that she will do this to her own mother. The son in this case has always had contact with his mother, has for the last 2 and a half years daily communications with his mother, and has for the same period of time had on-person contact no less than once a month, almost always twice a month and frequently more than twice a month. Mother has live in daughters house for over a year and it has only been the last 30 - 90 days the daughter has gone to these extremes.