Did he do something illegal?

As the court in Lewis v. Dep't of Licensing, 157 Wn.2d 446, 139 P.3d 1078 (2006) pointed out, Washington State has a statute (RCW 9.73.030) that...

What recourse does a person have when someone else driving their car gets into an accident?

The driver who wrecks a car is legally responsible for the damages. You can make an insurance claim and maybe talk them into paying. Policy...

Filing a provisional application while I decide whether to pursue and hire an attorney. Any cons to this?

See https://www.uspto.gov/patents-getting-started/patent-basics/types-patent-applications/provisional-application-patent

Am I legally bound to this reservation?

You could argue "force majeure". Hearst Commc'ns, Inc. v. Seattle Times, 154 Wn.2d 493, 115 P.3d 262 (2005)

I agree about consulting with your doctor. If your doctor agrees with your analysis of the situation, the medical records might comprise good...

We determine fault in a car crash by whether anybody was negligent (breach their duty of care) i.e. didn't watch where they were going, didn't obey...

How can I make sure that a dispute is final, avoiding additional demands with further threats of legal action?

Settlement of a dispute is often done with a "Release and Hold Harmless" agreement.

You don't file discovery requests, they go directly to the party. Where your discovery cutoff has passed, you can make a motion to amend the case...

How do I gain access to my settlement now that I'm 18?

Usually in that kind of situation, all you need is a court order to the bank to release your money to you.

The WA DOL can identify the registered owner of a vehicle by license plate. https://www.dol.wa.gov/about/contracted-plate-search.html If you...