Hi Cristym. I didn't know the Lutz family on a personal basis, but my friends who happen to live close by in their neighborhood saw a lot of crazy nonsense going on at their house. Mostly yelling and cursing and partying and it wasn't the house causing them to act like that. There have been different people who helped with writing the book for the Lutz family and later recanted some of the things they said by admitting they were a little bombed when this book was dreamed up.
Yes, it is true that the Defeos were murdered in that house before the Lutz family ever moved in and their deaths were horrible but it's rather sad that they didn't leave well enough alone and stirred up trouble. Even to this day there are crazy fanatics who camp outside the Amityville house hoping to see something paranormal happen.