Anchor: Your brother has no children. 
Entailed: Your brother is childless.
Contradiction: Your brother has three children.
Contradiction: There are only climbers there in summer and fall.
Contradiction: A snowboarder wearing blue and green flies down the side of the mountain with a scenic backdrop behind them.
Contradiction: I could too, and there is a lot more I could say about that.
Contradiction: Bananas became a popular crop in Jamaica.