Sayyidah Asma (may Allah be pleased with her) narrated: My mother came to me; she was hopeful (of my kindness) and a polytheist. I said: O Messenger of Allah! My mother has come, and she is hopeful and a polytheist; shall I maintain ties with her? The Messenger of Allah (peace and blessings be upon him) said: "Maintain ties with her."
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 20578