Domestic violence in teen couples. Which parent would be more effective to intervene?

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I’m currently watching a show where the mom and dad are sort of preoccupied with themselves to notice that their teenage daughter has entered the early stages of an abusive relationship.

The girl in the show is no more than 16. So in cases of domestic violence in teens which parent should intervene and help the daughter not only get out of the situation but also find her herself and help make her stronger so she knows not to put up with this in the future?

Is it just one parent’s guidance is needed over the other or is it a combination of both?

Side note: the parents don’t fight and never verbally or physically abuse one another in any way.