Question about the Bones Family

[Julie Holmes]

No: HPFGUIDX 55625

In canon, is it established that Voldemort killed Susan Bones' grandparents, or was it her parents? I'm fairly certain it is her grandparents, but for the life of me I cannot find the reference. Thanks in advance for any replies. 

. ·'´) 
¸.·´¸.·´¨) ¸.·*¨) 
(¸.·´ (¸.·´ ¸.·´ 
¸.·´¸.·*`·-»~*~*~Julie~*~·*`·-»
(¸. I've lost my desire for doing
    The deeds any dragon should do
     But since I can't alter my nature
     I guess I'll just terrify you.... ·'´) 
                                             ¸.·´¸.·´¨) ¸.·*¨) 
                                            (¸.·´ (¸.·´ ¸.·´ 
                                                      ¸.·´¸.·*`·-»draco*`·-»
                                                     (¸



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