Mordecai and Margaret sat on the park bench watching their son, RJ, playing with a new friend on the playground Benson and Thomas had decided to install. "Hmm." Margaret said. "What?" Mordecai asked, keeping an eye on RJ as he slid down the slide. Mordecai was kind of a paranoid dad. "I wonder why Eileen and Rigby needed the house to themselves today." She responded. Mordecai shook his head. "Haven't you learned by now, Margaret? That couple is a mystery." He said. RJ and his new friend, a green female parrot with a purple chest, came running towards them. "Mommy! Daddy! This is my new friend, Sasha! Guess what?" He said. "What, sweetheart?" Margaret asked. "I have a new baby bwother!" Sasha answered for RJ. "Oh, that's great!" Margaret said, smiling at the little girl. "She's gonna let me see him!" RJ said. Margaret nodded, but Mordecai looked nervous. "Um , can you let me come with you?" He asked.
So Mordecai, RJ, and Sasha went to see Sasha's little brother. A yellow baby duck sat in a stroller, where his mother sat reading a book. "This is my baby bwother and my mommy." Sasha said. RJ looked at the baby boy. "He's cute, Daddy." He said. "He is, isn't he?" Mordecai responded. "We don't have a baby at home like Sasha, Daddy." RJ continued. "I don't know if your mommy and I will have a baby brother or sister for you, buddy." Mordecai responded. RJ looked dissapointed.
The family came home shortly after Sasha and her family left. RJ bounded up to Eileen. "Aunt Eileen! I met a friend at the playground! Her name is Sasha,and she has a little brother!" He told her. Eileen smiled at her nephew. "Was her little brother a baby?" She asked. "Yeah!" RJ said, heading towards the fridge for a peice of cake from Margaret's birthday party the day before. "Awww, Aunt Eileen! You ate all the cake from Mommy's birthday party!" He said, dissapointed. Eileen giggled nervously. "Sorry, buddy." She said, hugging her nephew. "I see it, too! You're getting fat!" RJ went on. "RJ! Don't be rude!" Margaret scolded. "Everyone, Eileen and I have an announcement!" Rigby yelled. He looked at his wife, smiling. "Eileen, will you do the honors?" He asked. Eileen took a deep breath. "Everyone, I'm pregnant!" She announced. Margaret, Mordecai, Eileen, and Rigby had a group hug while RJ ran across the room happily. "There is going to be a baby in the house!" He squeled.