Do married sisters inherit in this case, or do they have a share, and if so, what is its extent? And does the nephew (son of the brother) have a share, and what is its extent?

"Issues of inheritance are complex and require a comprehensive enumeration of all heirs. The questioner can submit their query via the inheritance calculation link on the Islamweb website. Full sisters are not excluded except by the father, son, or grandson. The full paternal nephew is excluded by the father, son, grandson, full brother, and paternal half-brother. The full paternal niece is not among the inheritors but is considered a relative by blood (dhawi al-arham)."