It is a surprisingly short way. Allowing one yard per person, we arrive at the ancestor we share with chimpanzees in under 300 miles. The daughter that she is holding by her right hand is the one from whom we are descended. The two sisters are facing one another, and each holding their mother by the hand. Now the second daughter, the chimpanzee ancestress, holds her daughter's hand, and a new chain is formed, proceeding backwards towards the coast.
First cousin faces first cousin, second cousin faces second cousin, and so on.
By the time the double-back chain has reached the coast again, it consists of modern chimpanzees. You are face to face with your chimpanzee cousin, and you are joined to her by an unbroken chain of mothers holding hands with daughters. Mothers would love daughters, and feel affinity with them, just as they always do.