Willie the Kid (1952)

Little Willie's large imagination turns his family-home in the suburbs into the old Wild WEst when he puts on his cowboy suit, guns, holsters and hat, and goes out to play with his friend Archie.(No, this is not Archie Andrews.) The two boys have some desperate adventures, until Willie's mom calls him in to take his afternoon nap.

Unfortunately the movie Willie the Kid is not yet available on HBO Max.