law: Hindu Adoptions and Maintenance Act, 1956 
  12. Effects of adoption 
  An adopted child shall be deemed to be the child of his or her
  
  adoptive father or mother for all purposes with effect from the date of the
  
  adoption and from such date all the ties of the child in the family of his or
  
  her birth shall be deemed to be severed and replaced by those created by the
  
  adoption in the adoptive family:
  PROVIDED  that- 
  (a) the child cannot marry any person whom he or she could not
  
  have married if he or she had continued in the family of his or her birth;
  (b) any property which vested in the adopted child before the
  
  adoption shall continue to vest in such person subject to the obligations, if
  
  any, attaching to the ownership of such property including the obligation to
  
  maintain relatives in the family of his or her birth;
  (c) the adopted child shall not divest any person of any estate
  
  which vested in him or her before the adoption.
  Comment:  It is clear on a reading of the main part of
  
  Section 12 and sub-section
  (vi) of Section 11 that the effect of adoption under the Act is
  
  that it brings about severance of all ties of the child given in adoption in
  
  the family of his or her birth. The child altogether ceases to have any ties
  
  with the family of his birth. Correspondingly, these very ties are
  
  automatically replaced by those created by the adoption in the adoptive family.
  
  The legal effect of giving the child in adoption must therefore be to transfer
  
  the child from the family of its birth to the family of its adoption. Smt.
  
  Sitabai v. Ramchandra, AIR 1970 SUPREME COURT 343