It is narrated from Hazrat Asma that once my mother came during the time of the treaty with the Quraish, and at that time she was a polytheist. I asked the Prophet (peace be upon him), "Can I maintain ties of kinship with her?" The Prophet (peace be upon him) said, "Yes, maintain ties of kinship with your mother."
Hadith Referenceمسند احمد / مسند النساء / 26915
Hadith Gradingحکم دارالسلام:حديث صحيح، خ: 2620، م: 1003، وهذا إسناد ضعيف، ابن لهيعة سيء الحفظ، وقد توبع