Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) said: Whenever Sayyiduna Umar (may Allah be pleased with him) led us along a path, we found it easy. A case of a woman and parents was brought to him, and he assigned to the woman a quarter and to the mother a third of the remainder.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الفرائض / 12299