Yes

Firstly, although this did not make it into the movie the script includes a scene where Adam indicates that they are taking a vacation by adding a sign to the model of his store in his model town.

   To see the real Winter River, laid out exactly as the
   model, at the foot of the hill.  Adam breathes deeply
   and looks very pleased at the glorious town below him.


   ON HIS HUGE HAND AGAIN

   as it reaches into model and tweezes a tiny sign into
   the tiny window of Maitland's Hardware Store on main
   street.  It reads:

               ADAM AND BARBARA MAITLAND
                          ARE
                      ON VACATION!
                         HOORAY!

Secondly, and perhaps more obviously, when Adam visits the store he unlocks the door clearly indicating that the store is, in fact, theirs.

  Adam sprints up the steps of **his** lovely hardware store.
   OLD BILL, a slightly-addled ancient barber, is napping
   in a chair in front of his shop, next door to Adam's.
   Adam fumbles with the lock, not interested in conversation.