Abu Nazrah narrated from Sayyiduna Abu Sa'id Khudri (may Allah be pleased with him) and Ikrimah narrated from Sayyiduna Abu Bakr (may Allah be pleased with him) that they considered the grandfather in the position of the father.
Hadith Referenceسنن دارمي / من كتاب الفرائض / 2937
Hadith Takhrijاس روایت کی سند صحیح ہے۔ دیکھئے: [ابن أبى شيبه 11250] ، [سعيد بن منصور 40] ، [البيهقي 246/6]
Brief Explanation
(Commentary on Hadith 2936)
The meaning of this athar is that in the absence of the father, the grandfather will receive a share from the inheritance in the same manner as the father would receive.