Sayyiduna Abdullah (may Allah be pleased with him) related: Whenever Sayyiduna Umar (may Allah be pleased with him) took a path and we followed him, we found it easy. A case of a woman and parents was brought to him, and he gave the woman a quarter, gave the mother a third of the remainder, and gave the father two shares. [Sahih]
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الفرائض / 12300