What is the legal basis for recovering economic damages caused by a third-party's obstruction in a civil case?

Your statement does not appear to describe circumstances comprising a normal cause of action at civil law. If you were the victim of a crime,...

Purchased a generator via amazon.com from 3rd party. Advertised as new but they sent a recondition.

You should probably send it back. See https://www.atg.wa.gov/safeguarding-consumers

What can i do legally?

See https://www.atg.wa.gov/buying-car and https://www.atg.wa.gov/safeguarding-consumers

Can you follow people?

See https://app.leg.wa.gov/RCW/default.aspx?cite=9A.46.110 Your mother should have told you not to be mean to people.

My sister lost her 5 children a year ago all rights to them have been terminated.. She is now married and pregnant will cps

Child Protective Services agencies have a duty to guard the health, welfare, and safety of innocent children.

Can we sue a health care facility for performing a rape examination on minor without parents knowledge/permission?

Legal battles can be very expensive. See https://app.leg.wa.gov/RCW/default.aspx?cite=7.70

Write them a letter demanding what you want. Include copies of your medical bills and records.

The first question is whether the premises were unreasonably hazardous. You can try to send them a letter demanding compensation for your injuries.

Who do i talk to about this?

At the time of a motor vehicle collision, the adrenaline and endorphines often mask injuries. It can take some time for the swelling to accumulate...

Your insurance company should provide a defense attorney for you.