We all know how Finn's mom and dad are not alive. But we cannot help to not wonder, "How did they die?" Well, I think I have an answer to you; thanks to some fans I will credit in a second here.
Now, I'm sure you all remember the episode called "The Creeps" where Finn, Jake, LSP, Cinnamon Bun, Princess Bubblegum, and BMO are all in a house, for a party. They wear masks and LSP is famous for this by saying "My name is Duchess Gummibuns." with a lot of sass.
Do you remember when Finn thought everyone was dead, and he locked himself in a room? He started trippin out, and seeing things... Like a ghost lady. She had seaweed in her hair and was definitely dead. This character reappears in another episode.
In the 2nd episode, Finn is on a high chair, and the lady is right beside him.
Theory being, the lady was his mother. She drowned, with explains two things. One, the seaweed in her hair, and two, Finn's fear of oceans in the first season. Other aspects of this is that the house used to be Finn's house, which is why he saw her there.
I'm going to do some more research on his parents, because I have a few more leads. I'm putting the credits in my authors note.
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Adventure Time Conspiracy Theory
FanfictionThe background story to a show most of us love. I'm entitled to my opinion & this is it, so here you go.