A little boy in a purple jacket is buckled into his car seat.
Boy sitting in a car
Sitting in a car seat implies that the boy is a little boy.
exists e1 s1 s2 x1 x2 x3 x4.(into(e1,x3) & n_seat(x3) & of(x3,x4) & n_car(x4) & of(x3,x1) & n_male(x1) & Theme(e1,x1) & v_buckle(e1) & in(x1,x2) & n_jacket(x2) & a_purple(s2) & Theme(s2,x2) & n_boy(x1) & a_little(s1) & Theme(s1,x1))
exists e1 x1 x2.(ne_nam_boy(x1) & in(e1,x2) & n_car(x2) & Actor(e1,x1) & v_sit(e1))