Legal Question in Family Law in Washington

If by "family violence" you mean domestic violence, this is defined in RCW 26.50.010 as follows:

"Domestic violence" means: (a) Physical harm, bodily injury, assault, or the infliction of fear of imminent physical harm, bodily injury or assault, between family or household members; (b) sexual assault of one family or household member by another; or (c) stalking as defined in RCW 9A.46.110 of one family or household member by another family or household member.

It also defines family or household members as:

(2) "Family or household members" means spouses, domestic partners, former spouses, former domestic partners, persons who have a child in common regardless of whether they have been married or have lived together at any time, adult persons related by blood or marriage, adult persons who are presently residing together or who have resided together in the past, persons sixteen years of age or older who are presently residing together or who have resided together in the past and who have or have had a dating relationship, persons sixteen years of age or older with whom a person sixteen years of age or older has or has had a dating relationship, and persons who have a biological or legal parent-child relationship, including stepparents and stepchildren and grandparents and grandchildren.

I hope that answers your query.