The story of follows the Harper quadruplets—four siblings who share the same birthday but almost nothing else in common . Their lives are a constant whirlwind of sibling rivalry, messy mishaps, and comical chaos as they navigate the challenges of growing up. The Harper Quads The quads each have distinct, often clashing personalities:

The series centers on the quads’ ability to drive each other and their parents, Tom and Anne Harper, absolutely nuts.

: The oldest (by four seconds) and often the self-appointed leader. She is determined to prove she can do it all while frequently trying to find "girl time" away from her brothers.

: The "book-smart" sibling who considers himself the only normal one. His high IQ often leads him into trouble alongside his siblings, despite his attempts to be the "cool" leader.