He died and left behind a wife, mother, two sons and brothers and sisters
Question

                My Sister's husband died recently and has left behind some property. He has left following family behind him:

-Wife

-two sons (both minor age)

-Mother  (father has died many years before)

-3 brothers (one married, two bachelors)

-3 sisters (two married, one divorced)

How would his estate be divided among these people according to Shariah?  Pl. advice.?
Praise be to Allah.