Kharijah bin Zayd (may Allah have mercy on him) narrates from his father (may Allah be pleased with him) that the inheritance of uterine brothers is as follows: they will not inherit alongside children, or the son's children, whether male or female, nor alongside the father or the grandfather; apart from that, one of them gets a sixth, whether male or female. If they are more than one, whether male or female, they will inherit a third and divide it equally.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الفرائض / 12324