You need to direct this question to attorneys in Mexico.

You fill out the proof of service form for where he was actually served. Indeed, you don't really even fill it out because you are not allowed to...

Since your mother is still alive apparently, it is still her car. Yes, she is responsible for what is done with the car.

You may have an enforceable contract. You’re welcome to hire an attorney to review the actual documents and the actual communications in detail.

Possibly but it’s unclear what the damages would be. I think the bigger focus should be on the custody issues based on the lousy environment she is...

That’s nice you want them back. Attorneys want clients who ask their advice before they do a big transaction, not after. No one will get what...

Discuss with a personal injury attorney. Remember, you will need to demonstrate how the store was negligent so be prepared to discuss that.

You should discuss this with your lawyer. This forum is appropriate only for specific questions about general legal principles.

Not really. But it’s also not a much of a defense to say you didn’t read what you signed.

Unlikely this would be worth suing over. Rather, you should make a well thought out response to the review, both on Yelp and Instagram.