As for his similarity with his grandfather...

As for his similarity with his grandfather, Muhammad Mustafa (S): Taking up armed struggle and exterminating the enemies of Allah and the Prophet; and the tyrants and the oppressors. He shall be helped with the sword and awe and no flag shall be hoisted over him.

Of the signs of his reappearance are: The advent of the Sufyani from Shaam (Syria), the advent of Yamani, the call from the sky in the month of Ramadan and a caller who will announce from the sky his name and his father’s name.” 8 - Narrated to us Muhammad bin Hasan bin Ahmad bin Walid (r.a.): Narrated to us Muhammad bin Hasan as-Saffar: Narrated to us Ahmad bin Muhammad Isa and Muhammad bin Husain bin Abil Khattab and Haitham Ibne Abi Masruq Nahdi from Hasan bin Mahboob Sarrad from Ali bin Riyab from Abi Hamza Thumali from Abi Ja’far (a.s.) that he heard him say: “The most proximate to Allah, the Mighty and Sublime and the most knowledgeable about Him and the most kind to the people are Muhammad (S) and the Imams (a.s.).

So you enter where they enter and leave off whatever they leave. It denotes Husain and his descendants as the truth is with them and they are the successors and the Imams are among them. So wherever you see them, follow them and when they are not seen beseech the Almighty Allah and wait for the practice that you got (occultation) and follow it. Love what they love and hate what they hate. Very soon you will get deliverance.”…