Ubaydullah bin Abdullah bin Utbah (may Allah have mercy on him) narrates from his father that Sayyiduna Umar (may Allah be pleased with him) was asked about slave-women who are mother and daughter, and he said: I do not declare both of them together permissible. Ubaydullah said: My father said: I wished that Sayyiduna Umar (may Allah be pleased with him) had been stricter in this than he was.
The Shaykh said: Al-Muzani (may Allah have mercy on him) made a mistake in this, saying that Ibn Umar said "I wished"; rather, it is Ibn Utbah, there is no doubt about it.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب النكاح / 13933