If you know who the father is, it would be fraud to do what you describe. You need to follow the statutory process for changing your son's name,...

You can contact the BMV and see if the title is still in your name.

You need to hire a lawyer, open a probate estate, and investigate the actions of the uncle as POA immediately.

Depending on the amount of the check you will need to either file a petition to dispense with administration or an full probate.

You can file for the name change, and it would be up to the judge to decide if the reasons are valid enough.

You need to contact a South Carolina attorney immediately to advise you as to how to proceed.

Should be able to file an action to recover property that actually belongs to them.

You and your sibling were appointed as administrators by the decedent. Unless you can show concrete evidence why they shouldn't be an administrator...

You need to consult an attorney about whether a probate needs to be opened.

If she is his legal power of attorney she can handle his affairs the same as he can, such as signing over title to vehicles that are in his name...