law: Hindu Adoptions and Maintenance Act, 1956 
  7. Capacity of a male Hindu to take in adoption 
  Any male Hindu who is of sound mind and is not a minor has the
  
  capacity to take a son or a daughter in adoption:
  PROVIDED  that, if he has a wife living, he shall not adopt
  
  except with the consent of his wife unless the wife has completely and finally
  
  renounced the world or has ceased to be a Hindu or has been declared by a court
  
  of competent jurisdiction to be of unsound mind.
  Explanation:  If a person has more than one wife living at
  
  the time of adoption, the consent of all the wives is necessary unless the
  
  consent of any one of them is unnecessary for any of the reasons specified in
  
  the preceding proviso.