It's Diana's birthday and she gets all sorts of presents in this episode: creepy ghost children, creepy dolls, and her favorite shudder effect. During Lore we discover Liz's brother from another Charles Scudder while talking about Corpsewood Manor.

Sources:

https://www.investigationdiscovery.com/crimefeed/crime-history/the-cold-blooded-killing-of-the-gay-satanists-of-corpsewood-mano

https://www.motherearthnews.com/homesteading-and-livestock/castle-in-the-country-zmaz81mazraw

https://www.winterwatch.net/2019/12/corpsewood-manor-true-crime-like-no-other/

The Corpsewood Manor: Murders in North Georgia Petulla, Amy 2016.

Corpsewood: A true crime like no other Ellis, Daniel 2016

The Corpsewood Catchfly: A Witch's Tale Fults, Mark Elliot 2017

Corpsewood: The Eyewitness Account West, Shannon; Scott, Susan E.; Hudgins, Teresa 2015