Inheritance

Please advise of what is fair on unfair: My son passed on October 2020, he was married with one child ,he was working for Exxaro coal mine in Delmas. He was contributing to a provident fund. After his death wife claimed and get the moneys now what about the parents do they have anything to get from their child inheritance . The worst part is she got the money and ran away to where she knows with the child my grand child.