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From FenixWiki

Definition

Father is a predefined local variable. Every process has this varaible as soon as the frame; statement is reached within the process. Father holds the ProcessID of the process that called the current process.

Example

process first_process()  //declaration of the first process
begin
   second_process();  //which calls the second process
   loop
      frame;        //this loop makes "first_process()" a process rather than a function
   end
end

process second_process()  //declaration of another process
begin
   x = father.x;     //These two lines use the father variable to move this process
   y = father.y;     //to the position of first_process, as the father variable here holds the ProcessID of "first_process()"
   loop
      frame;  
   end
end

More information on functions and processes.