Hannah has watched Nathan wrestle a few times and wanted to try her hand at it. Since then she loved it so much, she now regularly attacks him. He does put on quite the show for his little sister, so I can see how this is fun for her. It's cute to see how much this big guy loves his little sister.
Nathan is helplessly overpowered by her baby chubby cuteness and loud giggles.
Game over! The boy lost and the girl is laughing in victory.