DNA testing confirmed the baby's remains do not match the DNA of Maria Jose Pico or her parents, ThinkSpain reported. Pico says an archaeologist and a cemetery worker confirmed the grave that was exhumed was her sister's and that her father identified the coffin.
Pico and her sister were born in 1962 and the sister supposedly died in early childhood. Pico, however, said she always suspected her sister was stolen.
Authorities are now investigating babies stolen from their families between 1940 and 1990.
So far, only one case has been resolved. A nun was put on trial for taking a woman's baby. The nun, who died before the trial ended, said she did so because the mother was not married to her daughter's father.
In that case, the woman and her daughter were reunited after 30 years.