Leaving aside George Spencer-Churchill, Marquess of Blandford, and a few other aristocrats, the latest-born of the descendants of Cornelius Vanderbilt is James

Leaving aside George Spencer-Churchill, Marquess of Blandford, and a few other aristocrats, the latest-born of the descendants of Cornelius Vanderbilt is James Vanderbilt (https://en.wikipedia.org/wiki/James_Vanderbilt https://en.wikipedia.org/wiki/James_Vanderbilt), currently worth by somebody's estimate $20M. The family also includes Anderson Cooper, a fair stock of earls and such, and a number of artists.