The answer the patient got (possible spoiler)

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Spoilers follow:



Perhaps it was because the "son" (the fellow that played Satin) was, in fact, the mother. If you'll recall the mother morphed into Satan in the background as the Sinbad character was telling him that he was just trying to clue him into how everything worked.

In addition the Satan character also revealed that he could be either a man or a woman was the situation required.

He had asked the doctor that question in the beginning of the movie. The doctor ignored responding... I came away with 2 interpretations. 1) the son (Adam) came before the mother (Eve). 2) We see the son in the movie and meet the mother later.

It is much more simply than people want to make it. Here it is. We meet satan first. He interacts with ty and they have all their little events. At the end the mother shows up with the apples, that the devil is so fond of. So we see that satan, the son, came first, then the mother showed up at the end right before ty was enlightened to his true predicament.