A group of people riding bicycles.
The people are a family.
A group of people doe not mean they are family.
exists e1 x1 x2 x3 x4.(a_topic(x1) & of(x1,x2) & Theme(e1,x4) & Actor(e1,x3) & v_ride(e1) & n_bicycle(x4) & (x2 = x3) & n_people(x2) & n_group(x1))
exists p1 x1.(n_people(x1) & exists x2.((x1 = x2) & n_family(x2)))