The kid is on a float in the snow.
A man is on a float in the pool.
A man is not a kid, and you can't be in a pool and in snow simultaneously.
exists p1 x1 x3.(n_snow(x3) & n_kid(x1) & exists x2.(on(x1,x2) & in(x2,x3) & n_float(x2)))
exists p1 x1 x3.(n_pool(x3) & exists x2.(on(x1,x2) & in(x2,x3) & n_float(x2)) & n_man(x1))