I assume you made a typo and "dad" claims she is a minor. This is a common scam. Just ignore them.

A lawyer would need to read your entire contract to answer your question.

If you are still within the time to appeal you can bring everything to a local defense lawyer to have them examine what issues are strong...

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The best person to ask is your lawyer who has seen it.

How you sue anyone is by hiring an attorney and having them do it. You have to decide if it is worth the expense.

Depends on all the circumstances......................................

Yes it is legal. Judges have wide discretion over what evidence they consider. You were outlawyered.

He doesn't have a contract with the plaintiff. It is your bill to pay.

Unless the car would have been under warranty if they had diagnosed it correctly I don't see an issue. Get it fixed.

What can you do? You can either rent from him or not.