The MGS universe is confusing to me. I never finished 4, but was so lost. And how many Snakes are there supposed to be?
Two Snakes that look the same. Solid Snake and young Naked Snake (who is also known as Big Boss).
Solid Snake is the clone of Big Boss. Big Boss also has two other clones (Liquid and Solidus), and these are Solid Snake's "brothers."
Liquid Snake doesn't look anything really like the others. There are resemblances, but it's not like he looks like a copy.
Solidus Snake doesn't look the others, but does look like Big Boss as he gets older. Solidus Snake is also known as the 43rd President of the United States of America, George Sears.