Makhul reported that the Messenger of Allah ﷺ assigned the inheritance of the son of a woman who had undergone the mutual imprecation to his mother, and to her heirs after her.
حدثنا محمود بن خالد وموسى بن عامر قالا حدثنا الوليد أخبرنا
مكحول قال جعل رسول الله ﷺ ميراث ابن الملاعنة لأمه ولورثتها من بعدها
Its chain of transmission is daif. Bayhaqi (6/259) narrated it from the hadith of Abu Dawud through him, and said, "The hadith of Makhul is munqati (with a broken chain)." So the chain is daif, and the hadith has many corroborating narrations in Bayhaqi and elsewhere, all of which are daif.