It is narrated from Hazrat Samurah (may Allah be pleased with him) in a marfu' form that if a person becomes the owner of any of his close relatives, then that relative becomes free.
Hadith Referenceمسند احمد / أول مسند البصريين / 20204
Hadith Gradingحکم دارالسلام:صحيح لغيره، وهذا إسناد ضعيف، الحسن مدلس، وقد عنعن