coheiress
noun
                                                                                                                            
                                                            co·heir·ess
                    
                                                                                                              
                                                                                                                                  ˌkō-ˈer-əs 
                                                      
                                                          
            
            variants  
 or co-heiress
        
    
            
               plural coheiresses or co-heiresses            
        
    
                                
              
          
                                                      : an heiress who shares an inheritance with one or more other heirs or heiresses                                      
              
                             
Old Mr Vere is dead; and his daughters, who were coheiresses to his estate, are all married …—
Frances Sheridan
                         
                
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  Merriam-Webster unabridged




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