I want to sue for my child supportback My child hasn'thad a passing grade in 5 years. And is now 15?

There don't appear to be any cases establishing precedent for what you want.

What can I do? Guardian was ordered to communicate with me & reimburse me before my next visit every month she has not complied?

See RCW 7.21 (https://app.leg.wa.gov/RCW/default.aspx?cite=7.21) and http://www.courts.wa.gov/forms/?fa=forms.contribute&formID=9

Form ?

See http://www.courts.wa.gov/forms/

That's probably an indication of a hold for the U. S. Marshall's office: https://www.usmarshals.gov/

If 141 is State Managed then what is 138??

Your statement does not provide sufficient information.

Can I adopt my biological daughter so that she can inherit a family trust

See https://www.dcyf.wa.gov/services/adoption.

Does my 17 year old need to be emancipated?

A child support order can specify when the support ends (i.e. age 18, emancipation, end of high school, the child is able to support him/herself...

Adult Child, grew up to have so many issues and husband always tried to help but she kept him away, child support back pay can

The time to work towards establishing or enforcing a parenting plan or residential schedule or child support order is while the child is under 18.

Adult Child now but the mom always denied father to see him? Would he be too late to file contempt. The boy needs help.

Usually, the time to try to establish or enforce a parenting plan or residential schedule is while the child is a minor.

Who do I serve if I do not have a lawyer and my ex has one?

See https://app.leg.wa.gov/RCW/default.aspx?cite=4.28.080