Do you mean that your son is suggesting that your estranged wife should give him power of attorney over her affairs?
Are you okay with that?
What exactly is it that you want to know about this?
She is entitled to appoint whoever she likes to have power of attorney over her affairs and if you think that he is not acting in her best interest, you can object to the Court of Protection/Office of the Public Guardian. To have him removed the if the power has not yet been granted, object to it being granted.
It would be worthwhile telling him that if he does apply, you will file an objection. Here is the process.
Can I clarify anything for you?
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We can still exchange emails if you wish.