In most cases, it would be difficult for a lighter person to lift someone significantly heavier than them. The ability to lift another person depends on factors such as the strength, technique, and leverage of the person attempting the lift. Generally, individuals with greater muscle mass and strength have an advantage when it comes to lifting heavy weights or other people.
While it's possible for a lighter person to lift someone slightly heavier through proper technique and mechanical advantage, there are limits to what the human body can achieve. The force required to lift a significantly heavier person might surpass the strength and capabilities of a lighter individual.
However, it's important to consider that lifting someone isn't solely dependent on body weight. Factors like body composition, distribution of muscle mass, and overall fitness level also play a role. For instance, a lighter person with well-developed muscles may be able to lift someone heavier than them compared to a heavier person with less muscle mass.
Ultimately, the ability to lift someone heavier depends on the specific individuals involved, their relative strength, technique, and other factors.