It is reported from Ibrahim and al-Sha'bi (may Allah have mercy on them both) that, regarding a daughter, a sister and a grandfather, according to the view of Sayyiduna Ali (may Allah be pleased with him) the daughter gets a half, the grandfather a sixth and the sister the remainder. He said the same regarding a daughter, two sisters and a grandfather, and regarding a daughter, several sisters and a grandfather.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الفرائض / 12443