Sheikh Nâsir al-Turayrî
This is a case of a man who is survived by no one else but his four daughters and his mother and father. His estate will be divided as follows:
His mother will be entitled to one sixth of the estate. His four daughters will share collectively in two-thirds of the estate. His father will receive what remains, which will be one-sixth of the estate.
Since the daughters share equally in their 2/3 portion, and since there are four daughters, each daughter will receive one-sixth of the estate.
Source: Islam Today