Shu’bi (may Allah have mercy on him) said: In Islam, the first person to inherit as a grandfather was Sayyiduna ‘Umar (may Allah be pleased with him).
Hadith Referenceسنن دارمي / من كتاب الفرائض / 2947
Hadith Gradingتحقیق (حسین سلیم أسد الدارانی):إسناده جيد إلى الشعبي، [مكتبه الشامله نمبر: 2956]
Hadith Takhrijاس روایت کی سند جید ہے۔ دیکھئے: [مصنف عبدالرزاق 19041]
Brief Explanation
(Commentary on Hadith 2946) This means that, in practice, the status of grandfather as a regular heir was first established by Sayyiduna Umar radi Allahu anhu.