How many of Millicent's parents and grandparents died during the month of May?
return Millicent ;return parents of #1 ;return grandparents of #1 ;return #2 that died during the  month of May ;return #3 that died during the  month of May ;return number of  #4 ;return number of  #5 ;return sum of #6 and  #7
['select', 'project', 'project', 'filter', 'filter', 'aggregate', 'aggregate', 'arithmetic']