It is narrated from Sayyida Asma’ (may Allah be pleased with her) that my mother (a polytheist) came to me desiring to meet me, so I asked the Messenger of Allah (peace and blessings be upon him), “Should I maintain ties of kinship with her (i.e., meet the polytheist)?” The Messenger of Allah (peace and blessings be upon him) said: “Yes.”
Hadith Referenceالسنن المأثورة / باب ما جاء في فدية الأذى / 502
Hadith Takhrijصحیح بخاری، الادب، باب صلة الوالد المشرك، رقم: 5978