These arguments can be never ending.
OK... .I think I get the picture.
None of this is "your fault"... .but if you want to help stabilize things for this family... .and by extension... the child, then YOU have to be the leader that brings stability to this relationship.
or
You need to decide to cut ties and move on.
If you keep going on the current path... .expect the behavior to get worse.
I don't believe CPS is going to be able to help. They will likely investigate and "offer services"... .but likely won't find anything they can "force".
OK... .big picture. Look at the quote. The reason the arguments are never ending... is that YOU have decided to let them go on.
Big breath... .think deeply about this. How likely is it that he will argue with himself?
Please don't change anything for a week or so. I really think you need to learn about your part in the relationship dynamic and then... .figure out if you are going to stick around for a while... .or leave the r/s.
IF you are going to stick around, YOU can change the dynamic... .all by yourself.
Note: He will not like it... .that is not your concern.
How does all of this strike you?
FF