Ziegler has a younger sister, Mackenzie (b. June 4, 2004), who is also an active dancer at the Abby Lee Dance Company, as well as an aspiring singer, two older half-brothers from her father's previous marriage and two older step-siblings.
Maddie tiene una hermana menor, llamada Mackenzie Ziegler (nacida el 4 de junio de 2004),la cual también es bailarina, actriz y cantante; y dos medios hermanos mayores, Tyler Ziegler y Ryan Ziegler, de un matrimonio anterior de su padre.