Tafsir: Al-Furqan 25:56

وَهُوَ الَّذِي خَلَقَ مِنَ الْمَاءِ بَشَرً‌ا فَجَعَلَهُ نَسَبًا وَصِهْرً‌ا (And He is the One who created man from water then made of him kinship of blood and kinship of in-laws. 25:54) نَسَب (nasab, translated above as 'kinship of blood' ) is that relationship which emanates from either parent, and صِهْر (sihr, translated above as 'kinship of in-laws' ) is that kinship which is drawn from the wife's side and is called in - laws. All these relations and bonds are Allah's graces given to mankind for a pleasant and tranquil life. If these relations are taken away from someone's life it will be impossible for him to live by himself.