Is it true that after the battle of Karbala there were no surviving sons of Imam Hassan (as)?

Battle of KarbalaImam al-Hasan
Is it true that after the battle of Karbala there were no surviving sons of Imam Hassan (as)?
Sayyed Mohammad Al-Musawi, Sayyed Mohammad al-Musawi is originally from Iraq and heads up the World Ahlul Bayt Islamic League in London. Other than being involved in various humanitarian projects, he frequently responds to... Answered 6 years ago

Not true.

Al-Hasan Ibn Al-Hasan who is known as Al—Hasan Al-Muthanna was injured in Karbala but was taken by Asmaa’ Ibn Kharija al-Fizari to Kufa and was treated there then went back to Madina.  He was looking after the charities left by Imam Ali ( AS ) in Madina.