The status of wives are declared in Quran clearly. At Surah An-Nisa 12. verse:
۞ وَلَكُمْ نِصْفُ مَا تَرَكَ أَزْوَٰجُكُمْ إِن لَّمْ يَكُن لَّهُنَّ وَلَدٌۭ ۚ فَإِن كَانَ لَهُنَّ وَلَدٌۭ فَلَكُمُ ٱلرُّبُعُ مِمَّا تَرَكْنَ ۚ مِنۢ بَعْدِ وَصِيَّةٍۢ يُوصِينَ بِهَآ أَوْ دَيْنٍۢ ۚ وَلَهُنَّ ٱلرُّبُعُ مِمَّا تَرَكْتُمْ إِن لَّمْ يَكُن لَّكُمْ وَلَدٌۭ ۚ فَإِن كَانَ لَكُمْ وَلَدٌۭ فَلَهُنَّ ٱلثُّمُنُ مِمَّا تَرَكْتُم ۚ مِّنۢ بَعْدِ وَصِيَّةٍۢ تُوصُونَ بِهَآ أَوْ دَيْنٍۢ ۗ وَإِن كَانَ رَجُلٌۭ يُورَثُ كَلَـٰلَةً أَوِ ٱمْرَأَةٌۭ وَلَهُۥٓ أَخٌ أَوْ أُخْتٌۭ فَلِكُلِّ وَٰحِدٍۢ مِّنْهُمَا ٱلسُّدُسُ ۚ فَإِن كَانُوٓا۟ أَكْثَرَ مِن ذَٰلِكَ فَهُمْ شُرَكَآءُ فِى ٱلثُّلُثِ ۚ مِنۢ بَعْدِ وَصِيَّةٍۢ يُوصَىٰ بِهَآ أَوْ دَيْنٍ غَيْرَ مُضَآرٍّۢ ۚ وَصِيَّةًۭ مِّنَ ٱللَّهِ ۗ وَٱللَّهُ عَلِيمٌ حَلِيمٌۭ ١٢
You will inherit half of what your wives leave if they are childless. But if they have children, then ˹your share is˺ one-fourth of the estate—after the fulfilment of bequests and debts. And your wives will inherit one-fourth of what you leave if you are childless. But if you have children, then your wives will receive one-eighth of your estate—after the fulfilment of bequests and debts. And if a man or a woman leaves neither parents nor children but only a brother or a sister ˹from their mother’s side˺, they will each inherit one-sixth, but if they are more than one, they ˹all˺ will share one-third of the estate—after the fulfilment of bequests and debts without harm ˹to the heirs˺. ˹This is˺ a commandment from Allah. And Allah is All-Knowing, Most Forbearing.
Faraid is the section of the Islamic inheritance law. Faraid is build on Quran and Sunnah mostly. According to faraid wives has two situations while becoming heirs.
Wifes Get Forth of the Estate If There is No Child of Deceased
If deceased man had no child, wife/wifes has 1/4 of the estate. Some examples:
If a man dies and there is a wife and his father left behind the division of the estate must like this:
Wife : 1/4
Father : Residuaries (3/4)
In this case father is from asabah. So he gets the residuary of estate. For further information for asabah visit Understanding Asabah in Islamic Inheritance Law: A Comprehensive Guide
Wifes Get Eighth of the Estate If There is a Child of Deceased
If deceased man had a child, wife/wifes has 1/8 of the estate. Some examples:
If a man dies and there is a wife, a son and his father left behind the division of the estate must like this:
Wife : 1/8 | 3/24
Father : 1/6 | 4/24
Son: Residuaries: 17/24
For more calculation download Faraid Calculator app below