It is narrated from Masruq (may Allah have mercy on him): A man died and had no heirs except a niece and a maternal uncle. He said: The maternal uncle receives a share equal to that of the deceased's sister, and the niece receives the share of her father (i.e., the share of the deceased's brother).
Hadith Referenceسنن دارمي / من كتاب الفرائض / 3091
Hadith Gradingتحقیق (حسین سلیم أسد الدارانی):إسناده صحيح إلى مسروق، [مكتبه الشامله نمبر: 3100]
Hadith Takhrijاس اثر کی سند مسروق رحمہ اللہ تک صحیح ہے۔ دیکھئے: [ابن أبى شيبه 11178]