This is set about two weeks before Rory and Amy's wedding and the Dr. Seuss book that Jack is referring to is Are You my Mother?
Jack slowly entered the baby's room. He had volunteered to babysit while Tony and Trisha had a date night and Rose, Rory, Amy and Sabrina did wedding things. It was only about 9pm but he hoped that the family would take a much needed breather and not be home until later.
Honestly Jack loved kids. There was just something about them, a lifetime of potential spread out in front of them that made him smile. Both Jamie and EJ could do almost anything they wanted, literally. Not every child had a family with a time and space ship. So as long as they didn't plan on taking over any part of the Universe, their Gran and Uncle Rory would take them anywhere they wanted to go.
It made him a little sad that he had missed out on so many things with his own daughter Alice and his grandson Stephen.
Jack sighed as he picked up the now squirming Jamie. The little boy was just waking up and Jack was ready for with a bottle and a fresh nappy. He had also brought him a very special gift that Gwen and Ianto had helped him put together, although neither of them really understood the joke. In fact Jack thought that the rewording and new illustrations of the Dr. Seuss classic were awe inspiring.
Making quick work of the bottle and clothes change, Jack settled down into the rocking chair with Jamie nestled in his arms. "This is the story of how your Granddad, Gran and I met." Cracking open the book, there was a small fair haired boy wearing a WWII gas mask illustrated on the page. Jack began to read. "There was once a scared little boy named Jamie. He lived in London during the Blitz. One night that little boy and the most important person in his world got separated.
"He looked everywhere for her. He found a tall man in a black leather jacket. 'Are you my Mummy?' Jamie asked the man.
"No, I'm not your Mummy. I'm the Doctor but I will help you find her."