Zach Roloff is the twin brother of Jeremy , but they are extremely different from each other; Jeremy is of normal height, while Zach is afflicted with dwarfism, he stands just a little under 4’0”. Zach has achondroplasia, and this resulted to serious health complications, which can endanger his life. Zach is an intelligent boy, a dedicated student who always brings home a steady stream of A’s and B’s from school. He is also an athletic boy, and has been playing soccer since he was little. Unlike Jeremy, Zach is more like his mother’s son, and he does not hold back when it comes to dishing out criticisms about his father. He is best known for his role on the TLC series Little People, Big World. The show lasted for six seasons and ended in 2010.