premise: A man is playing with a baby on a deck.
hypothesis: A man plays with his son.
explanation_1: Only because a man is playing with a baby doesn't necessarily mean the baby is his son.
explanation_2: The baby could have been his nephew as opposed to being his son.
explanation_3: Sentence 1 merely says a man is playing with a baby; we can't know for sure that the baby is his or that the baby is male. Thus we can't say the baby is his son from sentence 1 alone.
premise_logic: exists e1 x1 x2 x3.(with(e1,x2) & on(x2,x3) & n_deck(x3) & n_baby(x2) & Actor(e1,x1) & v_play(e1) & n_man(x1))
hypothesis_logic: exists e1 x1 x2.(with(e1,x2) & n_son(x2) & of(x2,x1) & n_male(x1) & Actor(e1,x1) & v_play(e1) & n_man(x1))