Chu's parents did not have him until they were in their forties. When he was in elementary school, his older brother, 12 years his senior, was already in college and his older sister, eight years his senior, was in middle school.
朱學恆的父母四十多歲才生下這個么子，所以他唸小學時，大他 12 歲的哥哥已經上了大學，大他 8 歲的姊姊也進了中學。