From the Holy Qur'an...
From the Holy Qur'an: "And beware a day on which no parent avails his child; nor will a child avail his parent." The Qur'an Chapter 31 verse 33. God does not penalize nor reward a human being for what is beyond his ability and without his choice. Being related or unrelated to the Prophet is not a matter of personal choice. None of us chose before our birth to be related or unrelated to a particular family nationality or race.
Therefore it would be very difficult for Muslims to believe that they should include Muhammad 's relatives in their prayers simply because they are his relatives. It Is Due to Their Merits Not Their Inheritance To dispel this apparent conflict it is important to know that the word "Aal Muhammad" which is repeatedly mentioned in the daily prayers does not include all his relatives. Only a very small number of them are included.
Had they all been included it would be a clannish or a tribal discrimination because many of them did not walk in the path of Muhammad and to place them above others is to advocate a clannish supremacy. Kinship to the does not mean acceptance by God; nor does it secure for his relatives a place in Paradise or insure them against Divine punishment.
God according to Islamic teachings has created Paradise for whoever obeys Him and the place of punishment for whoever disobeys Him regardless of family affiliation nationality or race. The Holy Qur'an even contains a chapter defaming Abu Lahab who was an uncle of the . "Perish the two hands of the Father of Flame and perished he. His wealth and whatever he gained did not avail him.... " The Holy Qur'an Sura Lahab Chapter 111.
The truth is that the word Aal Muhammad means only the "chosen" relatives of Muhammad. These chosen individuals are not chosen nor honored because of their relationship to Muhammad but because of their virtues. They lived the true Islamic life followed the instructions of the Holy Qur'an and the Messenger and never parted with them in word or deed.
When God informs us in His Book that the noblest among His human creatures are the most righteous and His Messenger commands us to honor the members of his house when we honor him we infer that they are the most righteous after the Prophet. Had they not been so they would not deserve such a unique honor and the Prophet would not have instructed us to honor them whenever we honor his name. To do otherwise would not be in accord with the Holy Qur'an.