Modification of Custody: Father Wants Custody

My question involves a child custody case from the State of: Washington.

Please help, so I moved out of state in march 2012 it is now September 2012. My sons father is now fighting the relocation, ihe is working with my ex husband and they both have the same lawyer. My ex husband has taken me back and forth to court for the last 8 year's for our daughter and I financially couldn't fight him anymore, now the lawyer is asking for my case with my daughter tbe unsealed to use in my now current case with my son an d his father and has sent me forms saying he is waiving his rights saying that there is no conflict of interest and that he wants to be able to give testimony against me. Am I able to decline or dispute his testimony and not allow them to open a sealed case with my daughter's information? My ex husband has a serious vendetta and could not honestly care how this effects my son and he is not even his, and my sons father is now making up all kids of stories and things and accusations which we never had issues before my ex husband had gotten wind of our custody modification, we had even had an agreed parenting plan and my ex husband called my sons father and talked him out of it. I don't know what to do or what to file to keep his testimony out, I know I can object I believe to keep him out because it directly links to my daughter case. I am a good mother and provide for my son from day one, he is five and he has lived in a stable loving home environment since birth his dad begged me to abort him then al if adoption would have been an option and now he has gotten a settlement and knows job wise I don't make enough to hire an attorney. I'm a single loving mother that could use advice