Quran 4:11

يُوصِيكُمُ ٱللَّهُ فِىٓ أَوۡلَـٰدِڪُمۡ‌ۖ لِلذَّكَرِ مِثۡلُ حَظِّ ٱلۡأُنثَيَيۡنِ‌ۚ فَإِن كُنَّ نِسَآءً۬ فَوۡقَ ٱثۡنَتَيۡنِ فَلَهُنَّ ثُلُثَا مَا تَرَكَ‌ۖ وَإِن كَانَتۡ وَٲحِدَةً۬ فَلَهَا ٱلنِّصۡفُ‌ۚ وَلِأَبَوَيۡهِ لِكُلِّ وَٲحِدٍ۬ مِّنۡہُمَا ٱلسُّدُسُ مِمَّا تَرَكَ إِن كَانَ لَهُ ۥ وَلَدٌ۬‌ۚ فَإِن لَّمۡ يَكُن لَّهُ ۥ وَلَدٌ۬ وَوَرِثَهُ ۥۤ أَبَوَاهُ فَلِأُمِّهِ ٱلثُّلُثُ‌ۚ فَإِن كَانَ لَهُ ۥۤ إِخۡوَةٌ۬ فَلِأُمِّهِ ٱلسُّدُسُ‌ۚ مِنۢ بَعۡدِ وَصِيَّةٍ۬ يُوصِى بِہَآ أَوۡ دَيۡنٍ‌ۗ ءَابَآؤُكُمۡ وَأَبۡنَآؤُكُمۡ لَا تَدۡرُونَ أَيُّهُمۡ أَقۡرَبُ لَكُمۡ نَفۡعً۬ا‌ۚ فَرِيضَةً۬ مِّنَ ٱللهِ‌ۗ إِنَّ ٱللَّهَ كَانَ عَلِيمًا حَكِيمً۬ا ١١

ALLAH decrees a will for the benefit of your children; the male gets twice the share of the female. If the inheritors are only women, more than two, they get two-thirds of what is bequeathed. If only one daughter is left, she gets one-half. The parents of the deceased get one-sixth of the inheritance each, if the deceased has left any children. If he left no children, and his parents are the only inheritors, the mother gets one-third. If he has siblings, then the mother gets one-sixth. All this, after fulfilling any will the deceased has left, and after paying off all debts. When it comes to your parents and your children, you do not know which of them is really the best to you and the most beneficial. This is ALLAH’s law. ALLAH is Omniscient, Most Wise.