Rhoda and Mark Berenson have made numerous trips to Peru -- about six a year over the last 15 years -- to visit their daughter in a variety of prisons. They were with her in Lima for the birth of their grandson in 2009 and again before Thanksgiving for her spinal surgery.
"It was really horrible in the beginning, but it has improved for Lori and all the prisoners," said Rhoda Berenson.
The mother said the birth of her son Salvador had a "huge effect on her in a very positive way."
"In those horrible years, something really wonderful came of it," she said. "Giving birth to Salvador meant that in spite of the Peruvian government's attempts to ruin her life, they didn't deprive her of motherhood."
Lori Berenson has said she still wants to help others and even though it's too late for her to become a doctor. Her mother said she told her she would like to do something "medically related" when she gets out of prison.
"She is still more interested in helping people than becoming rich," Rhoda Berenson said. "Those things haven't changed.