The Professor's eyes widened in shock, unable to believe what his mom said. If possible he wanted to erase those words out of mind right now and then.
"Stop speaking ill of grandfather just because you didn't like him. At least leave his soul in peace after he has died. Don't disrespect a dead man." The Professor said in a low tone, suppressing his anger as he didn't want to shout at his mother in front of all.
"Who killed your father?" Lady Amyra asked directly.
"It was the Grey Death group who killed my father. And that was why each and every member of that group was ferociously hunted down and killed by grandpa himself." The professor said matter of factly.
"And why had they suddenly decided to kill your father?" Lady Amyra asked, her expression saying no-more-nonsense.