This Comic's Cast:

One could assume that he was only able to go into the future and see what his kid did down the road because he was already not going to do something that would change the future. The very fact that he was able to go to the future (with the idea of changing things he didn't like) meant that he had already been unable to change the future ("already" being relative to the fixed point in time and not in his own subjective future) and therefore could have knowledge of the future because he couldn't do anything about it.
It gets confusing when you try to think too hard on it.
 
    

When evil spreads across the land, and darkness rises and the monsters roam. When the creatures of the night make beautiful music, and the things that go bump in the night go bump with greater enthusiasm. When the world is in peril and is in need of a hero...

These guys are, sadly, the best the world can hope for. These are the adventures of the heroes of CVRPG. They mean well, they try hard, and occasionally they do the impossible...

They actually do something heroic.