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Bjorn Tyrelle Olsen also known as "Grandpa Olsen" is or was the father of Mona Simpson and the husband of Linnea Penelope. He is also the maternal grandfather of Homer Simpson. He was a Entrepreneur form Scandinavia. Who moved to the US to try to get better business with his family. He did not approve of Mona's Relationship with Abe. He was thought to be still alive by his grandson Homer but that is unclear.

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