Cop story:
There was a couple in my town that lived in the crappiest apartments in town. We got called there for 7-8 domestics in the course of 6 months. I took the guy to jail when the girl broke his arm because he didn't show me that on scene and she had a black eye. Didn't get convicted.
I took the girl to jail while pregnant because he had bite marks all over him and she had no marks. Didn't get convicted.
We took them both to jail once and gave the kids to grandma and neither got convicted.
They finally split up but we'll never stop dealing with them because of the custody issue.....
I don't understand why people stay with each other when one or both are physically, mentally, or emotionally abusive.
But I agree with
@DaveNW that these two are used to this kind of thing. What a pathetic norm. And the worst part is that neither they nor their kids will ever know that this is not an acceptable way to behave.