1. C. Osculate is the word that does not mean hostility. Osculate is a term in mathematics. 
2. B. Efface is the word that does not mean a second appearance. To efface means to erase.
3. A. Decapitate is the word derived from Latin word for "head". Capita in Latin means head. 
        
                    
             
        
        
        
Aunt which your mother's sister   
also could be labeled as 
 aunt on the mothers side