If a woman dies and leaves behind two daughters, a son's son (grandson), a son's daughter (granddaughter) and nephews and nieces (children of her siblings), then the estate is to be divided as follows:
The two daughters (Razia and Sakinah) get two thirds, because Allah, may He be exalted, says (interpretation of the meaning):
if (there are) only daughters, two or more, their share is two thirds of the inheritance
The rest of the estate goes to Zubair and Tahera as relatives on the father's side, with the male getting twice the share of the female.
The nephews and nieces do not get anything.
And Allah knows best.
Reproduced from Islam QA