Sayyiduna A'idh bin Amr and Sayyiduna Abu Sufyan bin Harb (may Allah be pleased with them both) came on the day of the Conquest of Makkah. The Messenger of Allah (peace and blessings be upon him) said: "This is A'idh bin Amr and Abu Sufyan. Islam is mightier than both of them; Islam rises high and nothing rises above it."
Imam Ahmad (may Allah have mercy on him) said: Al-Hasan, Shurayh, Ibrahim and Qatadah (may Allah have mercy on them) said: When one of the two (parents) becomes Muslim, the child follows the Muslim one.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب اللقطة / 12155