My best friend is very close friends with the daughter of my parents' arch nemesis

Me and my best friend's friendship started back in 2020 and so it's been almost five years of our friendship. We used to live in this neighborhood and all the kids there used to be very good friends with each other. No beef. Nothing. We were like a big happy family.

Fast forward I had to move far away from that place due to my dad's job. But still kept in contact with the people thru my socials. And ofc me(I'm a girl as well) and her- being best friends always kept in touch with each other no matter what (yk what long distant best friends do). After we moved from that place my dad's nemesis moved in with his fam there and their daughter got close with my best friend gradually. This was back in 2023.

Let's call the daughter 'K'. So K's fam and my fam had this huge feud which dates way back to the 2000s-2012s. Shit was deep. My fam and her fam were like best buddies before. But that started to take a pretty dark turn due to her parents being fucked in the head. Her dad and mom did some pretty bad stuff, spread rumors about my parents, lied about some stuff regarding my parents to other people. Not only that- they were jealous of my dad's success in his job so they tried whatever means to cause harm to my dad, which did impact his job negatively. Very heavily. K's parents also paid some people to call and harass my mom by making them ask about her 'rates' implying that my mom was a prostitute and what not. Shit went on for days until my dad cracked it with some of his people and when the culprits were confronted- they confessed that it was K's fam that told them and paid them to do this. There was also this one time my mum burned her hands and stomach due to a fire incident (this was back when they were best buddies and this is where the feud initially started) and she called K's parents and requested them to inform my dad about the accident coz my dad was away in another city and mum couldn't get a hold of dad due to network issues. The accident was pretty serious and mum clearly told them about it. And yk what they did? they didn't inform my dad about it. I was small at that time( like 3-4 yrs old) so obviously I didn't know stuff like that and emergency lines like 911 weren't that much recognized at that time our country. K's parents kept quiet about it and brushed it off - mind you mum called them crying due to the pain. You have to be another level of insensible and fucked to not call the husband of a woman who's good buddies with you when she's been thru a fucking fire accident. Dad called at night time when he finished working- and then came to know mum has been through an accident and about how K's parents didn't say anything about it to him even though they had talked in the evening. The accident occured at noon. Dad confronted K's father about it and K's father was nonchalant about it and told him "yeah I won't do tell it to you even if it happens again- what will you do? report me?" or something like that. This is where the feud started and things started to go even more bad day by day as their true nature came out. Pretty much dad's whole friend circle came to know about it and the whole friend group of more than 50 people divided into two groups due to this feud. You can see how bad the situation was.

And now I heard a few days ago from my best friend about how she and K are close friends. And tbh I do not feel good about it. I have told my best friend about the feud and how I feel awkward and uncomfortable with K (we used to be playmates as well according to my mum but then our parents just didn't let me go or do anything with K due to the feud which is very logical since I was just 3-4 yes old). I just can't bring myself to like her due to the stuff her parents did to my parents. We're in some gcs together (gcs with people of the neighborhood where we moved out from) and sometimes we reply to each other's texts but I never talked with her one on one. Only talked with K once or twice in the presence of my best friend in video calls. Call me jealous or whatever but I don't get good feelings about that girl. Her fam is fucked up in the head and idk if she is to but the chances aren't zero. She seems very very sweet and bubbly with everyone and is even close with friend group I had in that neighborhood. Even closer than me it seems which is alright ig.

But it threw me off guard when I started hearing stuff from my best friend about how she said something very important regarding herself to K before she did to me which I was very chill with since I don't want to burden her and want to tell her stuff on her own will to me since we're best friends. I just feel bad about the fact that she didn't tell me or inform me about the shitty stuff she was going through and leaned on K instead ( which ig does sound like I'm jealous of K- ig I am low-key, but it's might be more because of the feud).

But then again- I told her about the feud at least two times in detail and about how I don't feel comfortable about K and feel awkward with her ( since we did talk on calls one or two times.) The first time I told her about it was when she first told me about K moving in and how they were becoming friends. And the second time was after some time had passed since their friendship. Idk if I'm wrong but it's bothering me a lot about how my best friend despite knowing all this still became close friends with K. After she told me about them being very close friends- I told her again about how I feel uncomfortable and awkward with K. She replied telling me about how if I make it awkward then it's gonna be awkward.

I just- didn't know what to say when I heard it. Idk what she's trying to say but I am adamant on not being friends or even acquaintances with K considering her parents did shit ton of harmful stuff to my parents coz The apple doesn't fall far from the tree. I'm planning on telling my best friend straight on about how I don't want to do anything with K. But idk what I should tell her or how I should tell her anything else. I don't want her to think I'm jealous - I'm not. I just get this bad feeling about K as well (it might fuelled due to my perception of her family but then again the apple doesn't fall far from the tree). My hunches about people have never been wrong till now. Besides we have this reunion of the neighborhood kids coming up. K will be there too. And my best friend as well. Idk what to do and how to approach the situation.

Any advices about this? I'd take anything. Any advices- or thoughts from y'all