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If the powers of attorney are not acting in the best interest of the person, then the family members could file a petition in court for a legal guardianship/conservatorship over the person and ask the judge to terminate/cancel the powers of attorney and to appoint a relative as guardian/conservator.
It doesn't matter if one of the POA's is a relative. The main issue is whether the person is acting in the best interest of the person or not....if not you can do the above.
If you are his spouse, then you should have the most right to challenge the POA's and ask the court to appoint you as his guardian/conservator and give you the authority to act on his behalf.