At 14, Marcus was an average-sized kid—5’6” and relatively athletic. His sister, Chloe, was 12, barely 5’0”, and still wore his hand-me-downs. Then came the summer of the growth spurt.

In the vast library of sibling archetypes, there are a few standard tropes we have come to expect. The older brother is usually the protector, the firstborn is the responsible trailblazer, and the younger sibling is the babied underdog—small, scrappy, and constantly asking for hand-me-downs. In my family, however, the script was flipped, shredded, and rewritten. My younger sister is not only my junior by several years; she is, quite simply, bigger, taller, and stronger than me.

A description of her training routine or the contrast between her "little sister" personality and her imposing physical strength. The Vibe: Empowering, intense, and loyal. 3. The Gentle Giant (Sweet/Slice of Life)

Siblings share approximately 50% of their DNA, but the specific combination of genes inherited can vary wildly. This can result in one sibling reaching the upper end of their predicted height range while another stays at the lower end.