Lewis Tappan

My eye was caught by this statement in this news article today:

Dun & Bradstreet dates back to 1841 when Lewis Tappan – the great grand nephew of Benjamin Franklin – set-up a business to provide credit information across the US via a network of reporters, just five years after the first commercial telegraphs were introduced.

I don’t have the name Tappan in my Virtual Cemetery of Franklin Descendants, and would appreciate any information about his relationship.