When a step-parent enters the picture, it can be an especially fraught new beginning -- for everyone involved. Stacie discovered this after she and Tim decided to make a life together. Tim came with two kids; Stacie had none. Nor did she have any idea -- at first, anyway -- what it meant to be a step-mom. Plus, Meredith and her sister, Brette, sing Mary Poppins. Sort of. Email us at [email protected].