Iz! They have so much fun playing together... not that they don't have their moments, but for the most part it is awesome! They love to set up places to "hide" for play and reading. They were reading animal book and Abbie was quizzing Iz, making her name the animals she was pointing to. Its funny to watch her be the mom! I love my girls and can't wait to have two more running around.. or at least keeping me up all night and all that other fun baby stuff!!!