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In my family, my dad is 5'11, my mom is 5'10. I'm 6'2, and my younger brother is 6'3, but my little sister is 5'6 (she is 19, and hasn't grown in several years) My sister was also born a month premature, which definitely affected her size for the first few years of her life, but I'm not sure whether the body makes up for it later in life or whether being a premature baby means you will be smaller as an adult or not. Maybe our good Studentessa di medicina above will have an answer for that one for you, assuming that it even applies to your case?