The father does not have to reveal the location of his 18 year daughter in parental abduction?

Persons in Washington State reach the age of majority at 18 for most purposes. https://app.leg.wa.gov/RCW/default.aspx?cite=26.28

What happens when a father and his daughter go missing?

If you are a witness about a crime, you should call the police.

What would US diplomats at the US embassy in Moscow do?

Law tends to be specific to the government in the geographical area. See http://legal.un.org/ilc/texts/instruments/english/conventions/9_1_1961.pdf

Is it legal in the UK for a parent to get a child a visa without the other parent's knowledge or consent?

You should have established a court ordered parenting plan where you live. It is unlikely anyone on this website would know much about British law.

How do I divorce my husband at little or no cost to I have a domestic violence restraining order against?

It is the court that issues a decree of dissolution. The respondent's signature is not necessary. See...

Is it possible to get divorced if my boyfriend signs paternity papers?

You can get divorced. http://www.courts.wa.gov/forms/?fa=forms.contribute&formID=13. You shouldn't allege paternity where it isn't true. You can...

How can I confirm a parenting plan was even filed with King County court?

Case lookup online through the following: http://www.courts.wa.gov/ or https://dw.courts.wa.gov/?fa=home.namesearchTerms

Custody battle in Washington state so my kids mom is pregnant by a felon whose up on charges for dealing drugs 4th time his prio

Yes. https://app.leg.wa.gov/RCW/default.aspx?cite=26.09.191

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What to do if your scheduled work is canceled with short notice by the company?

You may have a cause of action for breach of contract. https://www.avvo.com/find-a-lawyer

Can the FBI arrest a US citizen when she visits the US embassy in France?

See http://legal.un.org/ilc/texts/instruments/english/conventions/9_1_1961.pdf