Hazrat Mahdi (as) will be single

Al-Mas'udi narrates: "When Ali ibn Hazm, Ibn Siraj and Ibn Abi Said came into the presence of Imam Reza (as) on one occasion Ali ibn Hazm asked the Imam: ‘O son of the Messenger of Allah, we have related from you (the imams of the Ahl al-Bayt) that; EVERY IMAM WILL SEE HIS CHILD BEFORE HE DIES. (Is this true?)’ The Imam (as) replied: ‘Have you added this to the account? APART FROM THE QAIM [HAZRAT MAHDI (AS)]?’ (Al-Mas’udi, Ithbat al-Wasiyyah, p. 201)