Ernest Drew, nephew of John Carne Drew

I was searching the 1891 Census for an Ernest William Drew (born 1861, Camberwell, Surrey) who has no apparent connection to our lot. The reason I was searching is that Cousin Janet will go talking to strange men who happen to have Drew as a surname, and said strange man (Darryl Drew) rang me last night for a yarn about families and I was seeing what I could find out about his. Couldn't find any likely candidates, but just kept scrolling down and found this:

Ernest Drew, nephew, 2, born Penzance
and
Alfred Drew, nephew, 4, born Penzance in the household of John Carne and Rosina Drew at No.6 Customs House Lane in St Mary's, East part of Penzance.

Looking at the families of John Carne's siblings, I find I have no Alfred or Ernest as a child for any of them. Does anybody have an idea who might be the parents of these two boys?

A quick foray into FreeBMD gives me:
DREW, Ernest James, Penzance, 5c 247, December Quarter 1889
and
DREW, Alfred, Penzance, 5c 258, September Quarter 1887

Anybody want to chase the certificates? Looks like someone has to.

{Changed} Alfred and Ernest found here: Is this Elizabeth E Drew the daughter of John Carne Drew? If so, why, in 1891, were the boys described as "nephew" and not "grandson"?

1901 Census for St Mary's Penzance, 2 Abbey Place

Edwin Tredwin, Head, married, 47, Sailor Seas, Worker, Cornwall Penzance
Elizabeth E Drew, Boarder, married, 36, Charwoman, Worker, Cornwall Paul
Alfred Drew, Boarder, single, 13, Cornwall Penzance
Earnest J Drew, Boarder, 11, Cornwall Penzance
Sydney J Drew, Boarder, 7, Cornwall Penzance

Also in Abbey Place, at No.6
Susan Drew, Head, Married, 29, Cornwall Paul
William J Drew, Son, 3, Cornwall Paul
Emma J Drew, Daughter, 1 month, Cornwall Penzance.