context: Four youth and an elder man and woman playing in water just up to the bottom of man's swim trunks.
hypothesis: There is a better than even chance that grandparents watch their grandkids play in the water.
valid_hypothesis: There is a better than even chance that grandparents watch their grandkids play in the water.
invalid_hypothesis: Chances are slight that grandparents watch their grandkids play in the water.
hypothesis_assertion: Grandparents watch their grandkids play in the water.