Divination and Omens (Kitab Al-Kahanah Wa Al-Tatayyur)
Dawud :: Book 29 : Hadith 3939
Narrated Umar ibn al-Khattab:
Qatadah reported Umar ibn al-Khattab (may Allah be pleased with him) as saying: If anyone gets possession of a relative who is within the prohibited degrees, that person becomes free.