MUSLIM SIBLING INHERITANCE SHARE
Siblings refer to Full (or real), Half or Paternal (or consanguine), and Maternal (or uterine). The concurrent existence of one or more such relations is not frequent in the real world. The classifications of siblings include siblings share the same Mother (i.e., Maternal siblings), share the same Father (i.e., Paternal siblings), and share the same both parents (i.e., Full siblings). Under Islamic law, Muslim Siblings can inherit if no Sons (or Sons of Sons how low soever), no father (or father of father how high soever) survive under certain conditions with applicable Madhab's differences of opinion. Maternal siblings inherit 1/6 (i.e. one-sixth) if single and 1/3 (i.e., one-third) if multiple. Full and Paternal siblings inherit fixed or prescribed and Residuary share similar to children. Siblings can be either Full, Paternal, or Maternal. To understand these relations better, Refer to this blog and "Islamic inheritance sharers and residuary" to learn about siblings' shares.
There is certain Hajb (i.e. blocking or exclusion) rules are applicable for siblings. Full, Paternal and Maternal Siblings are blocked by Sons, (and Sons of Sons how low soever) and Father. Maternal Siblings are also blocked by Father of Father how high soever. Paternal Grandfather (i.e., Father of Father) how high soever blocks the Full and Paternal Siblings as per Hanafi, but not as per Shafii, Maliki, and Hanbali. However, Husband or Wife cannot block siblings and their descendants. Refer to "Islamic Inheritance Blocking Rules" to learn more. Also, you can refer the Siblings Islamic inheritance chart for more information.
You can learn more through Islamic Inheritance course. We encourage you to read our book, which includes exclusive details about Islamic inheritance sharers, shares, residuary, and distant kindred relatives.