context: A father sitting on an exercise ball holding his newborn, while his toddler son hangs on to his back.
hypothesis: Chances are about even that the father is getting ready to play with his son.
valid_hypothesis: Chances are about even that the father is getting ready to play with his son.
invalid_hypothesis: It is almost certain that the father is getting ready to play with his son.
hypothesis_assertion: The father is getting ready to play with his son.