Aberdeen Pig Farm in Red Dead Redemption 2: Explained
To understand this story, you will need to start here.
The Aberdeen pig farm is mentioned by this camper.
The farm is located here.
You have to go inside, If you drink the shot, you'll pass out. If you choose not to, you can leave.
But when you come back, you'll end up being drugged anyway. The Aberdeen lure travellers to their house, they murdered them, steal their money, and leave their bodies in the mass grave.
If you want to get your money back, you need to go back to the farm, and search the house to completely understand the backstory.
You can find a family photo in the bedroom, it lets you know that the aberdeens are siblings. The parents eyes are scratched but, they didn't approve of the incestuous relationship, and the couple killed them.
By the portrait, you can find their remains.
You can collect your money here. The aberdeens destroyed their parents' portrit, but they left the one with only their mother intact.
The Aberdeens loved their mother but didn't care much about their father. Probably, because the father was expressing his anger in a physical way.
If you hogtie Tammy Aberdeen, and bring her to the mass grave, she'll apologize to her mother for the things she's done. She never mentions the father.
The Aberdeen couple is inspired by a real life one-John Jr, and Kate Bender. John and Kate were siblings who claimed to be married.
And just like the Aberdeens, they killed travellers for their money. The Aberdeen family makes an appearance in Red Dead Online, you can work for them.