Since the most ancient times, the Hindu society has attached great importance to sons born of wedlock. They are believed to take care of their parents not only here but also hereafter. Performing śrāddha or obsequial rites which will help sustain the dead ancestors, has been considered as important as taking care of them here and now.
Among the twelve kinds of sons described in the smṛtis (vide Manusmṛti 9.159-160) the ‘aurasa’ stands first. He is the son born of the wife of the same caste married as per the rules given in the dharmaśāstras. He alone has the right to the father’s property and to the performance of the śrāddha rites.