Sis is 5-7". Hubby is 6-2". Daughter 1 is 5-10. Daughters 2-3 are both 6'. Sis says that is normal. Kids from same mom seem to get bigger as you go. I say it's just normal statistical variance?
Sounds pretty normal to me!
Sis married into family of 7 bros-sis's. 22 grand kids so far. Many teens now. At least 6 girls are 6'.