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Pretty interesting pattern in your family. From my experience, sons usually have similar heights as their father (myself for instance).
Assuming your grandfather was 6'7" (and not a typo), your father's height is a bit out of the ordinary. But you should base your predictions on your own parents, not the generations before them.
With that said, it's hard to tell how tall you will grow. Did you start growing recently? Judging from your age, I'd say you should still have some growth left. Just make sure you eat well, exercise, and most importantly, sleep well. Growth hormone will only release in significant amounts when you sleep, so don't miss the opportunity.
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