A man talking to a family unit holding some sort of probing device as they look on and smile to be polite.
A person talks to people in the course of their work.
A family unit is the peoples work, and a man is talking to them, therefore a person is talking to people while they work.
exists e3 e1 e2 p1 x1 x2 x3 x4 x5 x6 x7 x8.(a_topic(x1) & to(e1,x3) & Theme(e3,x6) & Actor(e3,x5) & v_hold(e3) & exists e5 e4 p2 p3.(Topic(e5,p3) & Actor(e5,x1) & v_smile(e5) & exists s2.(Theme(s2,x1) & a_polite(s2)) & exists s1.(Theme(s1,x1) & a_on(s1)) & Topic(e4,p2) & Actor(e4,x1) & v_look(e4)) & n_thing(x1) & as(e2,p1) & Theme(e2,x8) & Actor(e2,x7) & v_probe(e2) & n_device(x8) & (x6 = x7) & n_sort(x6) & (x3 = x5) & n_unit(x3) & of(x3,x4) & n_family(x4) & Actor(e1,x2) & v_talk(e1) & (x1 = x2) & n_man(x1))
exists e1 x1 x2 x3 x4.(n_work(x4) & of(x4,x3) & n_thing(x3) & n_course(x3) & in(e1,x3) & of(x3,x4) & to(e1,x2) & n_people(x2) & Actor(e1,x1) & v_talk(e1) & n_person(x1))