Late Father's Property Was Sold At Sheriff's Sale, Now Purchaser Wants To Pay Me To Sign Quitclaim Docs. Seems Fishy. [pennsylvania]

My deadbeat, estranged father died in 2014, and apparently owned property in Pennsylvania. I was made aware of this by a notice from the sheriff, in 2022, that it would be put up for sale if I had any interest in it. I didn't. At this point I will mention that the property has like 11k in liens, from him not paying taxes on it. A party did purchase it to flip, I guess, and began trying to get in touch with me last year, through my mother. They said they'd give me $500 to sign a document relinquishing rights to the property or some such. I really wasn't interested in getting involved in any capacity, so I just ignored it. Then, last week, while I was out, someone showed up out of the blue at a house I share with friends, same deal being offered. He said to my friend that he found my address through a "warrant". (I have none, btw) Both of those things rubbed me the wrong way. This past Monday, I got a letter from them, along with drawn up legal paperwork, for a "quitclaim," which I had never heard of until then. The funny thing is, the legal docs were drawn up by a lawyer, but the letter was from the property buyer, and used vaguely threatening language like, "If you sign this, you won't be pursued for any liens," etc etc. I was told a lawyer would be in touch if they didn't hear from me. Which brings us to today, when I was scared shitless by banging on my door, and sure enough they're wearing the shirt of the contractor company that is behind this. I'm not speaking to anybody until I get sound facts about this, so I chose not to answer. Again, things didn't seem above board, as they were walking to various parts of the house and took video as they were driving away of my friend's car and my car (ostensibly to get the plates?) My question is this: if I had no interest in this property, and someone else bought it with liens, why am I being asked to sign something? I should have absolutely nothing to do with it. Are they trying to get me on the hook for something? Moreover, if I tell them to take a hike, can there be repercussions down the road? I don't want to find out that, somehow, by not signing this thing, I spontaneously ended up with this debt. Not sure how that'd even happen, but it's foolhardy to not do my due diligence, here. To me, this is all in bad faith anyway. This, to me, is bordering on harassment, now. I spent my entire youth being abused by my parents, and now, ironically, even beyond the grave, because of this jackass, I have to put up with more of this crap. I just want to make sure I can tell them to go stuff it, without it coming back to bite me later. I can post pics of the documents and letter if need be, with redacted info of course, just wasn't sure what was allowed on this sub.