He is surprised to discover that Sydney happens to be better than Lily in various activities such as play the piano or paint .
In the meantime , Mitchell meets Lily 's ( Aubrey Anderson - Emmons ) new friend Sydney ( Aubree Young ) .
Mitchell is surprised to discover that Sydney happens to be better than Lily in various activities such as play the piano or paint .
In the meantime , Mitchell meets Lily 's ( Aubrey Anderson - Emmons ) new friend Sydney ( Aubree Young ) .