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 2 months 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.