At 70, Luisa Fernanda Marin Valenzuela is surrounded by a bustling family of nine children and seven grandchildren, but she believes there is someone missing from her family portrait. Valenzuela says a tenth child, a tiny son, was stolen from her after she gave birth in 1974, although she was told the child had died. &quot;The uncertainty of not really knowing...that really is shattering,&quot; she says.