Asma' bint Abi Bakr as-Siddiq said, "My mother came to me during the time of the Messenger of Allah, may Allah bless him and grant him peace, while she was still an idolater and I asked the Messenger of Allah, 'My mother has come to me, wanting something. Shall I give it to her?' He said, 'Yes. Give to your mother.'"
Riyadh-as-Saliheen by Imam Al-Nawawi, volume 3, hadith number 325 - Sunni Hadith