Leo: Given the sentence "A grandfather is holding his grandson while pushing a stroller at a baseball game." is it true that "A grandfather took his granson and son to the game."?
Mei: OK, So, let's think first...
Me:
A grandfather is holding his grandson while pushing a stroller at a baseball game does not indicate that a grandfather took his granson and son to the game.
Thus, the answer is it is not possible to tell.