Musannaf Ibn Abi Shayba 26:299

Waki’ narrated to us, he said: Musa ibn Ubaydah narrated to us, from Nafi’, from Ibn Umar, he said: The child of the woman involved in *li’an* (imprecation), his *asaba* (agnatic heirs) are the *asaba* of his mother; they inherit from him and he inherits from them.