الإمامُ عليٌّ (عَلَيهِ الّسَلامُ) : رُبَّ أخٍ لَم تَلِدْهُ اُمُّكَ. 
‪Imam Ali (AS) said, ‘Many a brother was not given birth by your own mother.’[Ghurar al-Hikam, no. 5351]