premise: A father sitting on an exercise ball holding his newborn, while his toddler son hangs on to his back.
hypothesis: The father has a son.
explanation_1: Holding his newborn son implies that has a son means he is holding his son.
explanation_2: The father has a "son" and he son is explained as " toddler son" .
explanation_3: "Has a son" is a rephrasing of "his toddler son."
premise_logic: exists e2 e1 p1 x1 x2 x3 x4 x5 x6 x7 x8.(a_topic(x1) & for(e1,e2) & exists e3 x1.(r_on(e3) & to(e3,x8) & n_male(x1) & Actor(e3,x6) & v_hang(e3)) & n_back(x8) & of(x8,x1) & n_son(x6) & of(x6,x7) & n_toddler(x7) & of(x6,x1) & n_male(x1) & n_male(x1) & while(e2,p1) & Theme(e2,x5) & Actor(e2,x2) & v_hold(e2) & n_newborn(x5) & of(x5,x1) & on(e1,x3) & n_ball(x3) & of(x3,x4) & n_exercise(x4) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_father(x1))
hypothesis_logic: exists e1 x1 x2.(n_father(x1) & Theme(e1,x2) & Actor(e1,x1) & v_have(e1) & n_son(x2))