Three years after her husband’s death from kidney cancer, Sarah Rodriguez revels in the milestones that weren’t supposed to happen as her 22-month-old toddler, Ellis, scoots across the floor and proudly pulls herself up on the living room sofa. “She’s feisty and stubborn and she’s determined to walk, so it won’t be long now,” Rodriguez, 35, tells PEOPLE exclusively. “It’s bittersweet because I wish that Joel could be here to see this, but Ellis will grow up knowing who he is. I talk about him like … read more