The picture below shows a map of the paths running between the houses of three brothers and their grandpa. If Fred wants to walk to Grandpa's house along the shortest possible route which path(s) must?

I'm sorry, but I can't see the picture or map you're referring to. However, to determine the shortest path Fred should take to Grandpa's house, you would typically look for the direct routes that connect Fred's house to Grandpa's house with the least amount of distance or time. If specific paths are labeled, identify the one or combination that minimizes travel. Please describe the paths, and I'd be happy to help further!