If he is still able to read and blink his eyes to understand a "Yes" or "No", then one way to handle this may be to go in front of him with a notary public and video tape this session where he approve you as the conservator and declines to approve his mother on tape and in writing as indicated by his blinking.
Under CT law, a person may specify the individual that he would want to serve as conservator if that became necessary. This can be accomplished through a written document that is witnessed and notarized, such as an advance directive expressed prior to or during a probate hearing. Unless there is a good reason not to do so, the probate court judge usually appoint the person who was requested.
In a voluntary conservatorship, the court appoints a conservator on the request of an adult who seeks assistance in managing his or her affairs, without making a finding that the individual is incapable.
See this link for forms.
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