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Answer: The first thing I suggest that you do (and it's free) is contact Adult Protective Services and share your concern that your father is being manipulated/taken advantage of by your sibling. You can do that here: http://www.cdss.ca.gov/agedblinddisabled/PG1298.htm
The next, more aggressive step is to file a petition for Conservatorship (perhaps of both your parents, if need be). If you file this, the court will appoint an investigator who will conduct an investigation and make recommendations to the court regarding (1) whether your father needs a conservator; (2) if so, who the conservator should be (it can be a neutral professional); or (3) the extent of the conservatorship. You should talk with an elder law attorney. You can find such an attorney at www.naela.org
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