Elizabeth Smarthas been candid with her children about being kidnapped when she was young. After the activist, 36, was taken from her family’s Salt Lake City home when she was 14 years old by preacher Brian David Mitchell and his wife, Wanda Barzee, and kept captive for nine months, Smart revealed her offspring are aware of the traumatic event she experienced. “They could tell you the overarching story,” the survivor said in a recent interview about what her kids,Chloe, 9, James, 7, and Olivia, 5, with her husband, Matthew Gilmour, know about her past. “My oldest would be able to tell you the …