Abhishek needs to take his girlfriend Aishwarya for a lunch date, so he asked his parents from the money. Both his father Amitabh and his mother Jaya gave him 10$ each.

At the restaurant, total bill comes out to be 17$. After lunch, Abhishek went home back and gave 1$ each to his mother and father.

To sum up, Jaya and Amitabh spend 9$ each and Abhishek keep 1$ for himself which sums to 19$

Where is the missing 1$?