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The assumption is implicit in the language: the grandparents begot one of your parents in the past, and your parents begot you. Thus the language implies a temporal order. Now your grandson builds a time machine, and goes back in time, where he accidentally kills your grandfather prior to the birth of your parent. Without a parent, where does this leave ...


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I am adding this answer to respond to your last followup comment on L.Levrel's answer. Point One: Alice and Bob have to agree on how many times Alice's clock ticks per rotation, and they have to agree on how many times Bob's clock ticks per rotation. Therefore, if Alice says Bob's clock is slow, Bob must say Alice's clock is fast, and vice versa. Point ...



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