All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger. We ask Allaah to exalt his mention as well as that of his family and all his companions.
If a man dies and leaves behind his mother, his wife, his brother and his sister, and did not leave any other heir, then all of them will inherit him in whatever he had left, whether a flat or else.
Therefore, if his brother and sister are full brother and full sister, or are brother and sister from the father's side only, then the inheritance will be divided as follows:
- The wife will get one-fourth as he has no sons. Allaah Says (what means): {…their (your wives) share is a fourth if you leave no child.} [Quran 4:12].
- The mother will get the sixth, as Allaah Says (what means): {…if the deceased left brothers or (sisters), the mother has a sixth.} [Quran 4:11].
- The rest will be divided between his brother and sister, the male a share twice that of a female. Allaah Says (what means): {…if there are brothers and sisters, the male will have twice the share of the female.} [Quran 4:176].
Based on the above, the inheritance should be divided into 36 shares; the wife gets one-fourth, which is 9 shares, the mother one-sixth, which is 6 shares, the brother will get 14 shares, and the sister 7 shares.
Finally, we ask you to fear Allaah and invoke him earnestly to turn your wife into a righteous woman and bless you with pious children, as Allaah is able to do everything.
Furthermore, you should advise your wife and invite her to abide by Allaah's Legislation, as all good whether the immediate or the delayed lies in following His Legislation. You should not give up or feel burdened in calling her with wisdom and good admonishing.
Allaah Knows best.