Well I called CPS yesterday and mentioned my military status and the person on the phone didnt seem to think that that would affect my ability to gain custody.

And also he recomended that my sister actually call CPS herself and speak to a Child in Need of Services (CHINS) person and give them her own information involving my mom. Same phone number (DSHS) in Washington.

I also spoke with my sister's friend's mother who has picked my sister up from my mother's house at all sorts of odd hours of the night because of my mother's and her boyfriend's drunken rage getting out of hand sometimes and this woman is willing to provide information to a CPS investigator.

I'm posting so other people can gain information from this or give me other helpful information as well or advice. Ill continue to post if anything else comes up.

Thanks for the posts so far!