This article argues that Charles Darwin's theory of evolution, specifically his concepts of evolution, natural selection, and survival of the fittest, were significantly influenced by, and in some cases directly taken from, his grandfather, Erasmus Darwin. The author contends that Charles Darwin understated his grandfather's contributions, creating a false narrative of originality. The article highlights Erasmus Darwin's book Zoonomia, showing substantial parallels with The Origin of Species, and points to Erasmus's influence on the intellectual climate through his membership in the Lunar Society. The ultimate purpose is to challenge the commonly held view of Charles Darwin as the sole originator of evolutionary theory, presenting a counter-narrative emphasizing Erasmus's pivotal role.