Can our 4 month old grand daughter and our 3.5 year old daughter legally share a room?

Your situation doesn't appear to be a problem, but you might want to check your city and county codes. http://mrsc.org/Research-Tools.aspx

Do I need to file an intent to move in my situation?

See https://app.leg.wa.gov/RCW/default.aspx?cite=26.09 (sections 405 and those following it)

Parenting plan?

It is vague what you mean by "notice to join the legal stuff", but perhaps you should indeed join while you have the chance. If you have received...

How should how should I go about getting someone out of trouble on a assult 2?

Maybe you should call the prosecutor and explain.

What should I do if my medical records are not just mine?

You should notify the health care provider and request that they correct their error.

How to reduce first time traffic ticket fine?

You can probably get a deferral. See https://app.leg.wa.gov/RCW/default.aspx?cite=46.63.070 (section 5)

See https://www.dshs.wa.gov/altsa/home-and-community-services/adult-abuse-and-prevention

Am I responsible for a defaulted debt my former step parent says is from my education?

A loan/debt is a contract. If you didn't agree to be a party to the contract, then it can't be imposed on you unilaterally.

Can I make a video online to share my experience of botched plastic surgery and talked about that surgeon without them suing me?

See https://app.leg.wa.gov/RCW/default.aspx?cite=7.70 "A defamation plaintiff must prove four essential elements: (1) falsity, (2) an unprivileged...

Are acquaintances with evil intent able to prevent my startup business from reaching success? Is protection needed?

Your statement and questions are vague. If you are serious about starting a business, retaining counsel would improve your chances. There appear...