Why did Hazrat Haroon [AS] called Hazrat Musa [AS] as ‘O Son of my mother!? Why not son of my father, you think they were born without father!
7:150 Moses returned to his people and was upset and grieved. He said, “You have chosen a terrible thing after me. Do you wish your Lord’s requital to smite you soon? He put down the tablets of the commands among them and questioned his brother, Aaron, very strictly. Aaron explained, "O Son of my mother! These people treated me harshly and took my patience as weakness, and almost killed me. Let not my opponents rejoice, and do not count me among the wrongdoers."