No that is absolutely a scam email. Block and report as spam.

If he is "not in his right mind" then he may not be able to grant you POA. Instead, you may need to seek guardianship.

Most times a social security card can be obtained online.

There is no impact upon SSD benefits from a Go Fund Me page. However, if you're really on SSI, then your benefits would be reduced or even...

Much easier to simply get replacement documents from the SSA and "vital records" respectively.

You can contact the police but it is they, along with the prosecutors, who decided whether or not to "press charges."

Prices will vary somewhat from one lawyer to the next. Make a few phone calls to local attorneys.

Here is the link to the SSA Office of the Inspector General: https://oig.ssa.gov/report/

No way to know for sure without speaking with them. It's also odd that the alleged overpayment has gone from $700 to $2600. You may wish to file...

I agree with Mr. Rafter. Stay off the internet / social media. Hire an attorney and speak only with them. Th jails are full of innocent people.