1. A family member as defined under the Hindu Succession Act, CANNOT be disowned or renounced and his heirarcy rights remain intact. Disowning is not possible via a will. However a will maker may not give any money/property to the proposed disownee, in his will.
2. However, if the family member is a habitual criminal (convicted), and/or indulging in forceful s*xual activity with family members and/or is a chronic non-reverseable drunkard/druggee and/or guilty of moral turpitude (any type) and/or declared habitual /proclaimed offender by the Central/State Govt. and/or (many other parameters) THEN ....
3. A procedure in the nature of a Writ, will have to be filed before the Civil jurisdiction in HC, for such declaration, with proper substaintiated documentary evidences. After giving appropriate oppurtunity to the family member concerned, the court may pass appropriate orders to alienate the family member from all lawful rights under the Hindu Succession Act. This order is effective for publicly disowning / rejouncing the particular family member from the parent family, thus effectively also lawfully disowning all the debts & liabilities of the disowned family member. This also effectively also means lawfully forfeiting all monies/assets/properties of the disowned member.
4. Dis-Owning is more prevelant in the Animal kingdom, wherein the parent animal disown their own children (sort of immediately) and/or even kill /eat their own children, for reasons best known to nature.
5. A classic example of disowning is "Divorce" wherein the Wife divorces (disowns) here Husband by a Divorce decree. Thus also effectively meaning disowning children due to wedlock results, subject to various parameters under the law.
6. Disowning / renouncing procedure is effective as long as the person from both sides are alive. Lawfully, a dead person cannot be disowned/alienated and his debts / assets / liabilities will have to be honoured.
Keep Smiling .... Hemant Agarwal