When it comes to figuring out who is the tallest in the family, the youngest always seems to take the Trophy for the category.
Over the years being the eldest out of the siblings also means being the shortest, and why is that? Every time we see most siblings walking together the Older one always seems to be the shorter one, Lol.
I do not think there is any genetic basis that suggests that younger siblings are taller.
Perhaps as time passes people have better diets and that might have some effect. It has been seen for example that every generation is getting taller and this does have to do with better diet and hygiene. Every argument with siblings that have this problem always ends with the younger one mocking the older brother/sister with, “At least I’m not one of Santa’s little helpers” Lol.
But all in all, it’s safe to say that times have changed from the Older sibling always having the upper hand in terms of height.