Why Inheritance Share Of A Wife Is Less Than Everyone Else
After the death a man his financial responsibilities for his children and widow shift to hir parents, not to his wife. Therefore they are entitled to have bigger share in the inheritance. If husband feels that her wife deserves more he is allowed to make his will in her favour. The laws comes only after the will.
The principle according to which the inheritance is distributed is that who is more financially beneficial to the person. God has delineated this. See the verse آبَاؤُكُمْ وَأَبْنَاؤُكُمْ لَا تَدْرُونَ أَيُّهُمْ أَقْرَبُ لَكُمْ نَفْعًا Parents are more beneficial to a person in terms of financial help. They spend on him and bring him up. and they become responsible after him for taking care of his family, as told earlier.