Look younger than your age

I have a question, is looking younger than your age a good sign that you'll grow in the future? I'm 17 and I'm 5"7. Everyone thinks I'm 15 or 16. My dad says it's a family thing. He and all his siblings are like me (but I don't know if they grew after 17 or if they were early bloomers, I don't know anything about their growth). One of them grew to 6"5 and the others to 5"1 1/6"0 (my dad is unfortunately only 5"6 and my grandpa was 6"5, my grandma was 5"3/5"4. That's why my dad is short).