Jenny is the youngest O'Malley sister. She is six when she is first seen in Samantha Learns a Lesson. She is said to have a high, fluty voice. She greatly loves stories. Unlike Nellie, she and Bridget are easily adjusting to their new well-to-do-life; this is most likely due to their age. However, she does miss her parents and cries in her sleep about them. She and Bridget have a private tutor after being adopted.