the hour glass turns

a woman i know, says she stands in the middle. like the shift in time. the sandwich generation they call it. parent on one side, kids on the other. more like a paradox . she sees the marbles roll, and hopes the table shifts back each time; and another has the marbles to play.

the woman asks, no trick question, but who is the daughter and who is the mother - who is the mother and who is the child?