Salah for a person who does not memorize any Surah of the Qur'an

Q 1: My father cannot perform Salah (prayer) well, therefore, I stand by his side to lead him in Salah. He does exactly as I do, i.e. when I say Takbir, he says it too. I recite Surah Al-Fatihah word by word and he repeats after me until the end of Salah, because he has not memorized any Surah from the Qur'an. When I finish Salah, I make a new intention and repeat my Salah inaudibly. I should mention here that I do not make the intention to lead my father or to offer Salah with him, (Part No. 6; Page No. 208

A: Teach your father Surah Al-Fatihah outside Salah and also the Dhikr (Remembrance of Allah) of Ruku` (bowing), Sujud (prostration), sitting between the two prostrations, the first and the last Tashahud then tell him to offer Salah in congregation in the Masjid (mosque) and he will learn how to offer Salah In sha’a-Allah. Tell him that it is obligatory to offer Salah in congregation at the Masjid because the Prophet (peace be upon him) stated: Whoever hears the call (Adhan) and he does not come to it (the prayer), then there is no prayer for him except with an excuse. Related by Ibn Majah and Al-Daraqutny Ibn Hibban and Al-Hakim graded it as Sahih (authentic) according to the conditions of Imam Muslim. Ibn `Abbas (may Allah be pleased with them both) was asked about the excuse mentioned in this Hadith. He said: Fear or sickness. It is related in Sahih Muslim on the authority of Abu Hurayrah (may Allah be pleased with him) that: A blind man came to the Prophet (peace be upon him) and said: O Messenger of Allah! I have no one to guide me to the Masjid (mosque). He, therefore, asked Allah's Messenger (peace be upon him) permission to offer prayer in his home. He (the Prophet) inquired: Do you hear the call to prayer? He said: Yes. He (the Prophet) said: Respond to it. There are many Hadith regarding the obligation of men offering Salah in congregation in the Masjid.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.