Decide if the obligation was met in the past. Mi vecino tuvo que ayudar a su abuelo. Not enough information, The obligation was met. The obligation was not met.
Mi vecino tuvo que ayudar a su abuelo means my neighbor had to help his grandparent. It says he had to help him but it doesn't explicitly says that he did or what he did to help him out. There is not enough information to confirm that he did. Hope this helps
