Hasan bin Muhammad (may Allah have mercy on him) said: The son of my paternal uncle had two daughters of his paternal uncle together in his marriage, and the women did not know where they should go. Ahmad (may Allah have mercy on him) said: (Meaning) the daughters of his two paternal uncles.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب النكاح / 13953