What is the share of the heirs of a deceased unmarried woman who has no children, but has a full brother and sister, a maternal half-sister, and a paternal half-brother and sister, with her mother remaining alive after her death?

If the woman has no heirs other than those mentioned, then her mother (who passed away after her), her sister from her mother's side, and her full siblings (brothers and sisters) only inherit from her.

The inheritance is distributed as follows: - The mother receives one-sixth due to the presence of a number of siblings, as stated in the Almighty's saying: ﴿فَإِنْ كَانَ لَهُ إِخْوَةٌ فَلِأُمِّهِ السُّدُسُ﴾ (If he has brethren, then for his mother is the sixth). - The sister from the mother's side receives one-sixth due to her being alone and the deceased having no ascending or descending relatives, as stated in the Almighty's saying: ﴿وَإِنْ كَانَ رَجُلٌ يُورَثُ كَلَالَةً أَوِ امْرَأَةٌ وَلَهُ أَخٌ أَوْ أُخْتٌ فَلِكُلِّ وَاحِدٍ مِنْهُمَا السُّدُسُ﴾ (And if a man or a woman has no direct heirs, but has a brother or a sister, then for each of them is the sixth). - What remains after the shares of the mother and the sister from the mother's side is for the full siblings (brother and sister) by 'ta'sib' (residuary inheritance), divided between them with the male receiving the share of two females, as stated in the Almighty's saying: ﴿وَإِنْ كَانُوا إِخْوَةً رِجَالًا وَنِسَاءً فَلِلذَّكَرِ مِثْلُ حَظِّ الْأُنْثَيَيْنِ﴾ (And if there are brothers and sisters, then the male receives the share of two females). - The paternal siblings receive nothing because they are excluded by the full siblings.

The origin of the inheritance is six, and it can be correctly calculated from eighteen: the mother receives three shares, the sister from the mother's side receives three shares, the full brother receives eight shares, and the full sister receives four shares.