Taliesin's mother winds the grandfather clock (at around 54 mins) putting the key into the left sprocket. At 83:45, Taliesin's father winds the grandfather clock, putting the key into the right sprocket. Typically, one sprocket winds the time mechanism and the other winds the chiming mechanism.
In the end credits, Morgan Hopkins is credited as playing Mr. Willis' son, which may be conceptually true, but which should be Mrs. Willis' son.