If my kids were present to a family domestic violence at there days house can I get a protective order for them?

The kids were at their dad's house and he hit his girlfriend in front of the kids. he does have a warrant DHS has came by and told me they're not going to open a case because I have the kids and they are safe and because one parent is safe they don't need to open a case now my question is can I go down and get a protective order for the children being present during a family domestic dispute