The 11-year-old sister gave birth to a healthy baby boy, and hospital sources told local news outlets that both she and the newborn are "doing well." Police are awaiting the results of a DNA test to confirm that the boy was 13 years old when he impregnated his sister. 17:41, 4 Jul 2019 | Bookmark Two teenage brothers have been arrested after allegedly raping and impregnating their 13-year-old sister. The incident came to light when the teenage girl complained.