IDK what to do

I love my in laws so much but sometimes they're my worst triggers from my previous life. It's always one of my siblings in law who are having drama spill into my house. Right now one of them is either talking shit or is associating with people who talk shit about me. ATP I don't know because this particular sibling lies all of the time. The thing is I've been the one more so calling them out on it because I don't think others really pay attention to what they say. But it's affecting me because my name is being brought into it for no reason. They're a grown as individual so I know I can't delegate who they associate with but ATP they were laughing about the whole situation all the while denying everything being said as well.... IDK what to do because it's triggering me to people I used to deal with in my past (those people mainly being my own bio family that I have now disowned due to toxicity they were giving off) For awhile today alone, I was brought to a low that I hadn't experienced since over a year ago ( another story for another day) I just don't know what to do.