A father and his son at the park, the dad has a bike propped up onto a tree checking the tire while his son is studying the tree.
The people are outside.
A father and his son are people, and studying the tree implies outside.
exists e3 e1 e2 p1 s1 x1 x2 x3 x4 x5 x6 x7 x8 x9 x10.(n_park(x10) & n_male(x6) & n_tire(x6) & n_dad(x1) & rel(e3,x7) & subset_of(x9,x7) & at(x9,x10) & n_son(x9) & n_son(x9) & of(x9,x2) & n_male(x2) & subset_of(x8,x7) & n_father(x8) & Theme(e3,x2) & Actor(e3,x1) & v_have(e3) & onto(e1,x4) & exists e4.(Theme(e4,x4) & Actor(e4,x9) & v_study(e4)) & n_tree(x4) & n_tree(x4) & of(x9,x6) & while(e2,p1) & Theme(e2,x6) & Actor(e2,x5) & v_check(e2) & (x4 = x5) & a_up(s1) & Manner(e1,s1) & Theme(e1,x3) & v_prop(e1) & (x2 = x3) & n_bike(x2))
exists s1 x1.(n_people(x1) & Theme(s1,x1) & a_outside(s1))