Children do not make the call as to where they live. That is done by agreement of the parents or the judge. The older the child, the more weight...

Your wife needs to go no contact with her mother and that means she can't live there. .

You will need to evict him/them. ...

Call Adult Protective Services in KY and they will investigate. ...........................................................

Motion to increase child support. . ...

I'm not sure he's competent to give you POA. POA is something given, not taken. You may want to look into guardianship.

The spouse is usually the first person that is contacted in situations. Complete the divorce and/or get a POA giving someone else the power. ...

Nothing. You owe the child support. I suppose you could make motion that the other parent also pays, but that would be unusual.

I would draft an agreed order and have it entered by a judge. After entry of the order put the vehicle in your name if the lender will allow it.

You need to file for divorce. Do not give her the child until there are court order to do so. .