can a person with dementia sign Power of Attorney form? can a person with dementia have a say so on Downsyndrome child age 37 or can I easily apply for both or their guardianship? please help me! I have a sister who with her lies & bad intentions moved my mother from her home after the death of my father, she also took my brother with DS, she now took them with a diff Dr who now claims nothing wrong with mother... she made mother sign her a Power of Attorney giving her all rights... we supposely are not allowed to inquire about her medical condition..Sister & husband are both Alcoholics, raised 3 girls, & kicked 2 of them out of their home, other one is living at their home unwed with a child, she told me mothers food was too expensive, & her check was not even enough to feed her... she is money hungry... now is my mother's POA signature be revoked? Help, I do not want a legal battle, for the sake of my poor mother! Have you been in similar situation? & what did you do? I Love my mother dearly she always made me promise I would watch over her in her old age, because she knew my good heart, I am heartbroken, it sure hurts... advise me please..