The song’s off The Adventures Of Mary-Kate & Ashley episode The Case Of Thorn Mansion. When Mary-Kate and Ashley get a call from a woman claiming to have seen some potential paranormal activity at Thorn Mansion, the twins decide to head to the mansion to investigate. But there’s “one small itsy-bitsy thing” standing in their way: their then-lesser-famous sibling, Lizzie Olsen. Little Lizzie just wanted to join in on the fun and do some big kid stuff, maybe even see a ghost. But Mary-Kate and Ashley weren’t having it: “We’d rather be picked up by a twister than tagged along after by a sister.” Harsh!

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This isn’t the only diss track Mary-Kate and Ashley have on one of their siblings. Poor Trent Olsen got the worst of it, with “Brother For Sale.” But hey, at least Lizzie Olsen gets the last laugh.