Kids are the same height as us

I'm not tall myself, but I have a tall husband (6,4tf/195cm), and I birthed tall son and tall daugher. They are both looked as 1-month old babies despite being newborns in hospital at their 2nd day.

And now, my son is 14 and he's the exact same height as his father and wears shoes 1 size up comparing to him, and my 11yo daugher is the same height as me (5,6, 170cm). It's so weird, they both grew up during spring a lot and I can't shake the feeling that I'm gonna be so small in my own family...

By the way, can you recommend any exercises for my son? He is feeling a litlle unstable after his grow sprout recently, his balance is out a bit.