law: Limitation Act, 1963 
  21. Effect of substituting or adding new plaintiff or
  
  defendant – 
  (1) Where after the institution of a suit, a new plaintiff or
  
  defendant is substituted or added, the suit shall, as regards him, be deemed to
  
  have been instituted when he was made a party:
  Provided  that were the court is satisfied that the
  
  omission to include a new plaintiff or defendant was due to a mistake in good
  
  faith it may direct that the suit as regards such plaintiff or defendant shall
  
  be deemed to have been instituted on any earlier date.
  (2) Nothing in sub-section (1) shall apply to a case where a
  
  party is added or substituted owing to assignment or devolution of any interest
  
  during the tendency of a suit or where a plaintiff is made a defendant or a
  
  defendant is made a plaintiff