Selling our deceased father's home. All beneficiaries are in agreement to sell the home. Now we want to change realtors?

Usually personal representatives of an estate are empowered to accomplish the function as appropriate. http://app.leg.wa.gov/RCW/default.aspx?Cite=11

How can we stop APS from harassing us??

You can petition the Superior Court for an injunction. http://app.leg.wa.gov/RCW/default.aspx?cite=7.40

If you sue, you can use the civil discovery process. CR 26-37 (http://www.courts.wa.gov/court_rules/?fa=court_rules.list&group=sup&set=CR). ...

Radiation Emitting Electric Meter on Our House in Washington State?

The utility companies appear to have certain regulations. http://apps.leg.wa.gov/RCW/default.aspx?cite=80

Can I sue someone for leaving a false review?

Your statement describes circumstances that may comprise grounds for an action at civil law for defamation of character, etc.

Can I stop the non-custodial parent from seeing my children if it's in the parenting plan?

You can have the parenting plan modified upon a showing of a substantial change in circumstances. A drug problem would be grounds for restrictions...

See http://app.leg.wa.gov/RCW/default.aspx?cite=59.20

Will I be able to adjust status?

You can interact with the USCIS website: https://www.uscis.gov/

Can California levy a bank account in Washington State for taxes, and the money seized can be proved to belong to someone else ?

Maybe you should sue the State of California, but the long arm of the law does extend over state borders often, and taxes must be paid.

Is the right to rescind period in Washington on used car contracts?

Usually, used car sales are "as is". Some people have a mechanic inspection before purchase. http://www.atg.wa.gov/used-car-considerations