Both my parents were living with her but we all took care them. She filed a petition to remove another sibling as personal administrator as my motherHad both parents sign an affidavit that the sibling was a fraud. I picked up my mom but was unable my dad. I have not seen my dad for over a year and my mom has not seen my dad for 5 months
"Marriage creates certain rights (inheritance, medical decision-making if designated, spousal privilege in court, etc.), but it ** does not ** guarantee unrestricted physical access in every circumstance. (My emphasis).
The right to see a spouse is usually recognized unless restricted by law, court order, or safety/medical policy."
Spouses have more rights in hospital, medical and facility settings. Not in prisons or jails, where visitation is considered a privilege, not a right.
If you like, consider contacting APS (Adult Protective Services) to see if a "wellness check" might be in order. Again, you will need clear explanations of what happened, when, and what now happens when your mother or you attempt to see your elder. This may not be a case for APS, but if they CAN help, at least that help would be without cost to you, whereas an attorney would not.
Do you know who is his PoA now (assuming he assigned one, like your youngest sibling)?
This is a question for an elder law attorney. We cannot really help you because we are only getting your side of the story. On this forum we often hear the "other" side, where responsible adult children have to block toxic other siblings. This is why you need an attorney, also because laws vary by state. If this sibling turns out to be the legitimate PoA for your Dad, you have very little power unless you can prove they are doing something illegal.
You can report them to APS, but if they go there an find nothing amiss, then you for sure will probably never get to see him again.
Are you worried that he is being neglected or abused? Or is this a money/inheritance thing? If it is not about money, and you don't think he is being neglected or abused, then what is your true concern? If you retrieved him would you be able to care for 2 very needy people?
I think talking to an attorney will help give you clarity to make important decisions.