A boy and a girl jumping in the air really high does not infer that the boy and sister jump in the air


Context: "A boy wearing brown shorts and a red t-shirt and a girl wearing khaki pants and a blue shirt are jumping in the air really high, they are on a round, white Asian looking bridge over a small river." Claim: "A boy and his sister jump in the air"
Considering the context, is the claim true, false, or unknown?