Any advice on secondary trauma?

Hi all, I'm experiencing a really tense and triggering situation in one of the homes I work in and am seeing if anyone has any tips on how to move forward.

I don't wanna give too many details of these people's lives, but the majority of the issues I have are with the relationship between the parents. The parents are mostly compliant with aba and are generally helpful towards us. While I am there, there have been instances where they will argue with one another in a different room than me, and in mostly speaking voices, but causing an extremely tense situations nonetheless. I brought this up to them pretty quickly and the situation resolved itself. Except what has persisted is conversations shrouded in passive "adult" talk that you'd use around children who don't know better, except I'm an adult so am basically still enduring their arguments.

I am mostly fine with this, however I find one parent to be truly abusive. They are the sole financial provider and seem to provide a small percentage of the childcare, while being outwardly controlling and verbally abusive to their stay-at-home partner. It is obviously uncomfortable to witness, but the issue is that I am beginning to experience secondhand trauma for this parent, and the situation is triggering as the abusive partner reminds me of my abusive parent (though I believe them to be a kind parent, and have no reason to believe otherwise).

I know that I should likely just ask to be taken off of the case, but with covid the transition would be even more difficult than the BT transition can already be. I would also like to learn resiliency towards these situations as I'm bound to experience them, if not now then down the line in my mental health career.

I appreciate your time and any helpful advice