What is the share of the full brother in the inheritance of his deceased brother in the following three cases: the wife's death before the husband, the husband's death before the wife, and the death of both spouses simultaneously?

If a person dies leaving only a full brother, then all of their inheritance goes to him by ta'sib (agnatic succession). If the wife dies first, then the husband, the husband receives half of her inheritance, and upon his death, this half transfers to his full brother. If the husband dies first, then the wife, the wife receives one-quarter of his inheritance, and this quarter transfers to her full brother. However, if they die simultaneously or there is doubt about who died first, there is no mutual inheritance between them, and each one's inheritance is inherited by their full brother. Matters of inheritance are sensitive and complex and must be presented to Sharia courts or discussed directly with scholars to verify all heirs, wills, debts, and rights before distribution.