Al-Sha'bi (may Allah have mercy on him) said: I was told that Sayyiduna Ali (may Allah be pleased with him) used to place the brother's sons, alongside the grandfather, in the positions of their fathers, and none of the Companions of the Prophet (peace and blessings be upon him) other than him used to do so.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الفرائض / 12321