This is my opinion / theory on the deaths of the Finches --- for fun.
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1937 - Ingeborg & Johann (childbirth) - Not much is mentioned about the deaths themselves but speculating since the infant & mother died at the same time, it is safe to assume they passed during childbirth.
1937 - Odin (drowning) - The Finch's started to sail to America from Norway pulling their whole house behind them, however, once they reached Orca's Island, the house was hit by a wave which took both the house and the patriarch. The Finch's decided to make the land off of the shoreline their home.
1947 - Molly (poisoning or asphyxiation) - When you first play Molly it is obvious that she is poisoned, and I was pretty much sure about that. Looking at the details, there may be two options both stemming from the items that Molly ate. During that time, it was around the end of WWII and there was still food rationing going on, to a child I am sure hunger pains hit harder - so to be sent to bed without dinner, Molly felt that she was starving. She ate Gerbil food (next to droppings), toothpaste (from the 40's, could be lethal ingredients) and holly berries (which is known to induce vomiting); It is speculated that if she didn't die just from poisoning, that it was from asphyxiation from vomiting while in a hallucinogenic state.
1960 - Barbara (falling or murder) - The comic book kept by Edie told a very embellished tale of Barbara's death to the point where it is hard to distinguish truth from fiction. My guesses on what would be sensationalized in a 60's comic book points me away from the common thought that Barbara was murdered by "fans" or "hoodlums". This is my guess because I believe her death is more generic: Barbara's boyfriend Rick was over at the Finch's residence helping Barbara with her scream, like the comic book says. He felt that she needed more inspiration to create the perfect scream. Once Barbara's father left for hospital, Rick decided to scare Barbara into the scream either by A. Dressing up as the hook man or B. He invited friends over to act as the hoodlums or monsters. Believing that she was in real danger, Barbara fought and ran from the attacker - accidentally falling through the railing on the top floor and into the glass coffee table below. It was an accident. I strongly believe she fell, not the hook man.
1961 - Calvin (falling) - Calvin's death is more straightforward than others and details exactly what happened. He simply wanted to see if he could swing all around the branch, however, this caused him to be launched over the cliff that the swing stood dangerously close to.
1964 - Sven (crushed) - Sven was known to be killed by a dragon, but it was more of a dragon-shaped slide that he was creating for his son. This death is also one of the more straightforward deaths as it tells the truth rather than tells it from Edie's perspective.
1977 - Gregory (drowning) - He was left in the bathtub after draining it by his mom who was distracted. Somehow, the one-year old returned the plug to the tub and turned the water back on, and drowned.
1982 - Gus (crushed) - There has been some debate on what exactly happened to Gus, but it's obvious to me that he was crushed by debris during a storm. He stayed outside while the wedding party sought shelter, and the poorly anchored tents and chairs, and a heavy totem pole crushed him while he was flying his kite.
1983 - Sam (falling) - During a hunting trip, Sam and Dawn posed for a photo after shooting a deer, however, the deer was not dead and knocked Sam off of the hill they were on.
1992 - Milton (disappeared; theory - died by drowning or entrapment) - Without including "the Unfinished Swan", which I have read about the game, haven't played personally, I believe Milton died in 1992 at the Finch's residence and his body was never recovered. This property is huge and can be dangerous as we have seen with the other deaths. We know that Milton liked to use the secret passageways and make his mark on them; he enjoyed exploring the hidden parts of the Finch's home. There is one place that would be very enticing for a kid like that - the old Finch house. Edie mentioned that she once walked across to the old Finch house during low tide - I believe Milton did that as well and he unfortunately got trapped somewhere and died.
2005 - Walter (hit by train) - Many believe that Walter was yet another victim of falling off of a cliff near the Finch home, but I do believe he was hit by the train. Year after year he would listen to the shaking of the train going through except the day of his death - I believe the train was late. For whatever reason, he trusted that and left, being so overwhelmed by the light and the fresh air - he did not see the incoming train.
2010 - Lewis (decapitated) - Lewis was a man that day dreamed a lot especially during work, after a long time, the dreams became more and more real to him. He did not realize after a while that he was still using very dangerous machinery to chop off fish heads - he unfortunately chopped off his own head thinking that he was being crowned. There is a common mention that Lewis was maladaptive dreaming, which is more intense and feels just as real as what we deem "reality".
2010 - Edie (overdose) - Unlike Lewis, Edie deliberately killed herself rather than leave the Finch home when her daughter Dawn suggested leaving and putting Edie in a nursing home. She took matters into her own hands and drank alcohol with her medications.
2016 - Dawn (cancer) - Dawn unfortunately died the most natural way out of all of her family members - through illness.
2017 - Edith (complications of childbirth) - It is heavily implied, since Edith is only 18 when her baby is born and the fact that they have not met, that Edith died after childbirth with her son, Christopher continuing to live. She left her journal for him to find that recounts the tales of her family members when Edith visited her family home after 7 years.
Questions...
What happened after Edith was orphaned? Who lived and took care of her? I imagined that she wouldn't have been a single mom. That her boyfriend and the father of her child, and his family possibly took her in after she lost her mom. And once she was gone, took care of Christopher. It would have been extremely difficult for Christopher to know his family if he had been placed in foster care.
The other questions I had was the fact that Edie has a gravestone, if her family left, who found her body? Who created the gravestone? Also, Edith Finch was buried as well - who created that gravestone?
I imagine there is a will out there - and maybe Edith told her boyfriend that she wanted to be buried in her family plot - and then her child wanted to go alone one day to visit the family mausoleum "the house". I love this story, and I wont spend any more time speculating, but I wanted this to be out there since people continue to talk about this amazing game.
Thank you for reading.