law: Transfer of Property Act, 1882
  47. Transfer by co-owners of share in common property
  Where several co-owners of immovable property transfer a share
  
  therein without specifying that the transfer is to take effect on any
  
  particular share or shares of the transferors, the transfer, as among such
  
  transferors, takes effect on such shares equally where the shares were equal,
  
  and, where they were unequal, proportionately to the extent of such shares.
  Illustration
  A, the owner of an eight-anna share, and B and C, each the owner
  
  of a four-anna share, in mauza Sultanpur, transfer a two-anna share in the
  
  mauza to D, without specifying from which of their several shares the transfer
  
  is made. To give effect to the transfer one-anna share is taken from the share
  
  of A, and half-an-anna share from each of the shares of B and C.