Who should inherit a woman? If she is survived by a husband, son and daughter how would the inheritance be calculated? What would be the situation if the daughter had already passed away?

WomanHusbandSonDaughterInheritance
Who should inherit a woman? If she is survived by a husband, son and daughter how would the inheritance be calculated? What would be the situation if the daughter had already passed away?
Sayyed Mohammad Al-Musawi, Sayyed Mohammad al-Musawi is originally from Iraq and heads up the World Ahlul Bayt Islamic League in London. Other than being involved in various humanitarian projects, he frequently responds to... Answered 5 years ago

Her husband gets one quarter. The remaining three quarters goes to the son and daughter who were alive when the woman died. Two shares for the son and one share for the daughter. 
If the daughter had already passed away before her mother, the son will get the three quarters.

Wassalam.