Is it permissible to give the sons of one wife from the estate more than the sons of the other wife? (Part No. 16; Page No. 525)
According to Ijma` (consensus of scholars), this act is impermissible. The process of dividing the estate, which is explained by Allah (Glorified be He) in the Qur'an and shown by the Prophet (peace be upon him) in Sunnah, is an obligation prescribed by Allah. In Surah Al-Nisa', after mentioning the Ayahs of inheritance, He (Glorified be He) states,
These are the limits (set by) Allâh (or ordainments as regards laws of inheritance), and whosoever obeys Allâh and His Messenger (Muhammad صلى الله عليه وسلم) will be admitted to Gardens under which rivers flow (in Paradise), to abide therein, and that will be the great success.
And whosoever disobeys Allâh and His Messenger (Muhammad صلى الله عليه وسلم), and transgresses His limits, He will cast him into the Fire, to abide therein; and he shall have a disgraceful torment.