Inheritance

We have an issue of distributing land amongst our family. My Grand mother died. She had 4 daughters and 1 son. The son died before her death, So according to islam is their any distribution of land amongst the family of her deceased son or not. I mean how could the whole land be divided by 4 daughters and the children of the deceased son. Remember the son died before my grand mother death. thanks for your precious time and consideration.