With regard to reading Quran for the deceased people, there is a difference of opinion among the scholars as to whether the reward from that will reach the deceased. The scholars who allowed it did not specify the amount of reading or mandated completion of the Quran as there is no evidence of such practice.
The scholars who did not allow it claimed it does not benefit the deceased and it should not be practiced. They claim that there is no evidence to such practice and because the Messenger (peace and blessings of Allah be upon him) did not do that for his companions who died during his lifetime, neither did the companions (may Allaah be pleased with them all) do that either, as far as the authentic evidence reports.
According to the consensus of the scholars, honoring the deceased by giving in charity on their behalf and making du’aa’ for them, is something our beloved Prophet indicated, so it is highly recommended to practice these acts.
The Messenger of Allah (peace and blessings of Allah be upon him) said: “… or a righteous child who will pray for him,” because the righteous child is more likely to have his/her du’aa’ answered.