“Whatever division of inheritance was made during the Ignorance period, stands according to the division of the Ignorance period, and whatever division of inheritance was made during Islam, it stands according to the division of Islam.”  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ مَا كَانَ مِنْ مِيرَاثٍ قُسِمَ فِي الْجَاهِلِيَّةِ فَهُوَ عَلَى قِسْمَةِ الْجَاهِلِيَّةِ وَمَا كَانَ مِنْ مِيرَاثٍ أَدْرَكَهُ الإِسْلاَمُ فَهُوَ عَلَى قِسْمَةِ الإِسْلاَمِ