Changes in Store (Complete)

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So does this mean that this story might continue on?

Also, The ending kind of confuses me? How old is he/she at the end? Is he/she still a teenager? Or possibly closer to the mother's age?

Another thing, considering that he/she called the mother by her first name, is he/she closer to the mother in age or possibly is the mother now closer to his/her age?

I am just trying to clarify what happened in the ending.