When he went up [to Palestine from Babylonia] [R. Hiyya] asked him, ‘Is Aibu alive?’
‘[Ask me whether] my mother is alive,’ he replied.
‘Is your mother alive?’ asked he.
‘Is Aibu alive?’ he replied.
Which would almost be a comedy routine if it weren’t conveying sad news: both were dead. Incidentally, R. Hiyya’s short period of mourning serves as an example for how to mourn when the news of death has been greatly delayed. Instead of the traditional 7 days, only 1 day of mourning is observed – and any part of that one day (say the knowledge is given in the afternoon) counts as the whole.