Is it more common to be shorter or taller than your parents?

Anonymous
In my family, the newer generation seems to be getting taller, even with the female members.

On my father's side:
Great-grandfather was said to be 5'6 and great-grandma 5'1
Grandparents, respectively 5'8 and 5'4
Parents, respectively 5'11 and 5'6

On my mother's side:
I only know my great-grandma was 5 ft
Grandparents, respectively 5'10 and 5'3
Then off course my parents...5'11 and 5'6

My two brothers and me:
Brothers: respectively 6'1 and 6'3 (the very first 6 footers in the family)
Me: 5'9

Is this more common? For the newer generation to continue growing?
Is it more common to be shorter or taller than your parents?
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