This is a little boy and his dad playing a board game.
A dad and son playing a board game.
A "dad and son" is a rephrasing of a "little boy and his dad".
exists p1 x1 x4.(n_dad(x4) & of(x4,x1) & n_male(x1) & n_thing(x1) & exists e1 s1 x2 x3 x5 x6 x7.((x1 = x2) & subset_of(x4,x2) & Theme(e1,x6) & Actor(e1,x5) & v_play(e1) & n_game(x6) & of(x6,x7) & n_board(x7) & (x4 = x5) & subset_of(x3,x2) & n_boy(x3) & a_little(s1) & Theme(s1,x3)))
exists e1 s1 x1 x2 x3 x4 x5.(a_topic(s1) & subset_of(x2,s1) & Theme(e1,x4) & Actor(e1,x3) & v_play(e1) & n_game(x4) & of(x4,x5) & n_board(x5) & (x2 = x3) & n_son(x2) & subset_of(x1,s1) & n_dad(x1))