He, sallallaahu 'alayhi wa sallam, was eager to call his relatives to Islam:

Abu Hurayrah said that the Prophet of Allah, sallallaahu 'alayhi wa sallam, stood up when Allah revealed His Saying (which means): «And warn, [O Muhammad], your closest kindred.» [Quran: 26:214] and he, sallallaahu 'alayhi wa sallam, said: "O Quraysh, save yourselves, I can do nothing for you to protect you from Allah, O children of ‘Abd Manaaf, I can do nothing for you to protect you from Allah. O ‘Abbaas ibn 'Abd Al-Muttalib, I can do nothing for you to protect you from Allah, O Safiyyah, the aunt of the Messenger of Allah, I can do nothing for you to protect you from Allah. O Faatimah bint Muhammad, ask me whatever you wish of my wealth, but I can do nothing for you to protect you from Allah."

An-Nawawi, may Allah have mercy upon him, said: “The meaning of this is for them not to rely on their relation to the Messenger of Allah, for he cannot protect them from any harm that Allah has decreed for them.”

In the narration mentioned in the book of Muslim, he, sallallaahu 'alayhi wa sallam, mentioned at the end: "But you have ties of kinship upon me that I will uphold in a good manner."

The Prophet of Allah, sallallaahu 'alayhi wa sallam, also called his cousin 'Ali to Islam when he was young, and he responded and believed in him and was the first child to become Muslim. At-Tirmithi (a scholar) said: "Some of the people of knowledge said that the first man to become Muslim was Abu Bakr, and 'Ali became Muslim when he was only eight years old, and Khadeejah was the first woman to become Muslim."