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Mr. Olsen is the father of Mona Simpson and the husband of Mrs. Olsen. He is the maternal grandfather of Homer Simpson, the paternal great-grandfather of Bart Simpson, Lisa Simpson, and Maggie Simpson, and also the grandfather-in-law of Marge Simpson. in the episode The Winter of His Content" Homer reveals that he is alive, yet Grampa never visits him or acknowledges his existence; defending his own behavior towards Grampa. Lisa is shocked about Orville being alive and nervously changes the subject however this could also be Orville Simpson.

Appearances

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