With the same chain, Imam al-Tabarani said: Sayyiduna Abd al-Rahman bin al-Harith (may Allah be pleased with him); his kunyah was Abu Muhammad. Sayyiduna Abd al-Rahman bin al-Harith bin Hisham (may Allah be pleased with him) was ten years old at the time of the passing of the Prophet (peace and blessings be upon him).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب المناقب / 16258