There are several factors that could contribute to siblings being different heights. Genetics play a major role in determining a person's height, so it is possible that the siblings inherited different height genes from their parents. Additionally, environmental factors such as nutrition, exercise, and overall health can also impact growth and height development.
In the case of an older brother being shorter than his younger sister, it could be due to a growth spurt that the sister experienced at a younger age, causing her to surpass her brother in height. Hormonal changes and development during adolescence can also play a role in determining height differences between siblings. Ultimately, height differences between siblings are a natural part of genetic variation and growth patterns.
What might be the reason that a brother and sister are such different heights or that an older brother might be shorter than his younger sister?
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