Sayyiduna Zayd bin Thabit (may Allah be pleased with him) said regarding the shared-inheritance case (al-mushtarakah): Suppose their father was a donkey; the father has only increased them in closeness. And he made them share in the third.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الفرائض / 12473