Here is an estimated timeline. Black font is from the show, purple font is from the interactive "house" on the website.
I think ya'll should check out the "manifesto" on the computer in the 2000's murder scene. Very interesting in relation to the show.
Also, in a 1984 murder scene this quote is fingerpainted on the wall in blood, "You fear what you desire. You desire what you fear." Hmm. Explains a lot about what the current characters see/imagine/are tormented with.
1922: The house is built. After an unknown time period the couple facilitate and perform abortions.
1926: Dr. Charles kills unknown abortion seeking patient to harvest her heart for the rebirthing of his child. Nora Montgomery attempts to murder Infantata then kills husband (Charles) and self.
1944: Newlywed murder and/or suicide (possible love triangle suspected by groom involving brother?)
1957: Loraine Baxter murder/suicide. Love triangle with William Baxter and Celia.
1968: The "nurse" (Janice and Gladys?) murders
197?: Alex ? murders sister and/or family, cuts them to pieces.
1978: The ginger twins, Troy and Bryan, are murdered.
1983: Constance murders her husband, Hugo, and Moira.
1984: Marquis De Sade-style murders of Samuel and Nikki Argento. (By same ghost that wears rubber man suit?)
1994: Tate Langdon goes on murder spree and is killed by SWAT team in the home.
1994: Larry Harvey kills Constance's son, Beau, for her so he can stay in the house as a ghost.
199?: Larry Harvey's wife, Lorraine, kills herself and her daughters; Larry is severely burnt and the institutionalized for a time.
2000's era murder/possible suicide of Cultural Anthropologist or Biologist and her family.
2010: Chad and Patrick are murdered by Rubber Man.
2011: Bianca (died off property?), Fiona, and Dallas killed by Tate and ghosts during home invasion.
2011: Hayden McClane murdered by Larry Harvey.
2011: Joe Escandarian (Armenian Guy) murdered by Moira and Larry (off property)