To best avoid jail time or an arrest, stop posting case specific facts on public forums such as avvo, resist the temptation to speak to insurance...

Probably not a good chance since his brother is already referring to the complaining witnesses as "victims." Best thing he, you, and your parents...

It would likely only be a felony if you have 3 or more DUI priors within 10 years or if there was an injury to another person other than yourself...

Looks like you may need experienced counsel in both Washington and California to best assist here.

PETITION TO SEAL AND DESTROY ARREST RECORDS under (PENAL CODE § 851.8(I)

Best move is to hire a locally experienced criminal defense attorney to make sure this process is handled correctly.

Legal Terminology for case Status and Embarrassment due to Arrest Record

Start the petition for factual innocence process under PC851.8

Is there a limit for restraining orders and how far is the background of a defendant affects.

Say What?

COnsult with a locally experienced civil attorney.

Do I have any option to fight my deportation ?

reducing your felony to a misdemeanor cannot hurt. But it's always best to consult with a locally experienced immigration attorney first, then...

If the victim is now 18 while the case is happening, can she drop the case or dismiss the case to the DEA.

It's not your decision whether or not to "drop or dismiss the case" but your input is definitely appreciated by the DA's office. Call them and/or...