Jennifer was born only a minute or so before her twin brother Benjamin Dalton. Percival's father, Benjamin, had also mentioned to Harriet that Jennifer had her eyes. They eventually move to New York with their parents after Percival’s father dies. She and her brother are mentioned in "The Return of Nellie", since they couldn’t come and were staying with Percival. According to an agreement between her parents and grandparents she will be raised as a Christian while her brother will be raised as a Jew.