Jeremy Forrest's sister has told Daybreak that her family are "trying not to judge" her brother or his actions.
Forrest was sentenced last week to five and half years for five charges of sexual activity with a child and one count of child abduction.
Speaking about her brother's time in prison, Carrie Hanspaul said: "He's been doing brilliantly, he's done a lot of work with a lot of other prisoners".
More top news
The Duchess of Cambridge has been on maternity leave since the week before Easter.
The Duke and Duchess of Cambrige have been together for 15 years and will have three children under the age of four.
News of William and Kate’s third child was announced on September 4 and the duchess went on maternity leave on March 22.