The Prophet ﷺ’s Brother: Abu Sufyan ibn al-Harith (ra)

He was the first cousin of the Prophet ﷺ, and his brother in that he was nursed by the same woman. He was one of the closest and most beloved people to him. When Islam came, he turned his back on the Prophet ﷺ and became a bitter enemy until the very end where after a painful reunification, came a beautiful ending.