Darwin's grandfather, Erasmus, who died before Darwin was born, was a doctor who dabbled in mechanics, natural history and poetry.
In the 1790s he published Zoonomia or The Laws of Organic Life, which offered one of the earliest musings on evolution. The term Darwinism, was first used in reference to Erasmus in the 1700s.
Despite his great intellectual legacy, Darwin was considered a very ordinary student.
He was taken out of school by his doctor father at the early age of 16 to study medicine in Edinburgh. But he grew disenchanted, developed a morbid fear of human blood and quit after 2 years.
He was encouraged to become a clergyman instead and took up studies in divinity, classics, and mathematics at Christ's College Cambridge.
Source : site Descent of man.