英语翻译If my father had known of it he would have died a second

这里应该是一种比喻,可以说成是“如果我父亲要是知道了,他得(从坟墓里出来)再死一回”,理论上说“他”的父亲应该已经去世了,但是他的作作所为能令他的父亲再气死一回.
would have dide a second time 是再死一回的一种比喻说法.