In the "Metal Gear Solid" series, what's the name of Solid Snake's brother?

In the Metal Gear Solid series, the name of Solid Snake's brother is Liquid Snake. He is one of the main antagonists in the series and is a genetically modified clone of Big Boss, just like Solid Snake. However, unlike Solid Snake who was created to be the perfect soldier, Liquid Snake was given inferior genes and therefore holds deep resentment towards his brother. Throughout the games, Liquid Snake seeks to prove his superiority over Solid Snake and plays a pivotal role in the overarching storyline of the series.