A father playing a song on his guitar for his son.
A person is playing an instrument.
A father is a person. A guitar is a type of instrument.
exists e1 x1 x2 x3 x4 x5.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_play(e1) & on(x3,x4) & for(x4,x5) & n_son(x5) & of(x5,x1) & n_male(x1) & n_male(x1) & n_guitar(x4) & of(x4,x1) & n_song(x3) & (x1 = x2) & n_father(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_instrument(x2) & n_person(x1))