The lead singer (Dave Draiman) was on tour in 202 when his Grandfather, a Jew, died in Israel. At a young age, Draiman was beloved by his grandfather; however, when Draiman became a heavy metal musician, his elder cut off their communication. It wasn't until the grandfather fell ill that he wished to see his grandson.
But by the time word got to Draiman, who was on Ozzfest, his grandfather had mere hours to live.
Regarding his grandfather's death, he noted, "No one could look at the aura I projected over the course of that next week and not feel my pain and those feelings very definitely will present themselves on the record."
BTW - they do a version of "Shout" (Tears for Fears) in this album.