From a legal standpoint there are two next steps; do contact qualified TX counsel, don't speak with McD's. Good luck.

No consent = no insurance. Strongly suggest you speak with and/or retain an attorney.

Can we sue?

Yes; and the prior incidents should help with establishing notice. Look to retain qualified TN counsel.

Can I sure a car repair shop?

Yes, you will likely need to sue them. Perhaps small claims court. Try to obtain the police investigation as to the cause of the fire.

You and your brother should have been listed as "interested parties" in the litigation. Speak directly with an attorney. A will could affect the...

Can you get sue if you threw a empty plastic bottle to your friend and it bounce to some one else ?

Yes. She could also file a grievance at work and a criminal complaint.

Can a Lawyer keep money awarded to a Plaintiff in a Personal Injury Car Accident Claim for himself and not pay any medical bills

No, an attorney may not keep money allotted for bills. However, in all likelihood this did not occur. Ask for an accounting.

Can the family sue for negligence?

Yes, it can be done. Best to discuss with qualified IN counsel to properly make this determination. Sorry for your loss.

If my lawyer turn in my demand letter on June 18th how long will it take my check to hit

When you say "hit", do you mean receive? Also, do you have liens?

Yes, but have to imagine that comparative fault will play a role. Good luck.