A family is sitting in a hut.
People are indoors.
A family is a group of people and "sitting in a hut" indicates the people are indoors.
exists e1 x1 x2.(in(e1,x2) & n_hut(x2) & Actor(e1,x1) & v_sit(e1) & n_family(x1))
exists p1 x1.(exists x2.((x1 = x2) & n_indoor(x2)) & n_people(x1))