Why are my sisters both tall and i'm not? I am 19 and still under 5ft (4'10") and they are both 5'7" and 5'8" but they are 3-4 years younger than me?

Anonymous
My dad is tall (6ft) so I should be the tall one because i'm a guy. My sisters should be short like my mom who is 5ft. also, are they done growing now if they are 15 and 16? I heard girls stop growing before guys so I hope I start getting taller soon.
Why are my sisters both tall and i'm not? I am 19 and still under 5ft (4'10") and they are both 5'7" and 5'8" but they are 3-4 years younger than me?
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