Last week I came across this interview with the Countess of Burlington http://www.telegraph.co.uk/women/life/meet-lady-burlington-future-duchess-walking-footsteps-mitford/.
In the interview it is mentioned that she and her husband William, Earl of Burlington, heir to the Dukedom of Devonshire now have three children. Further down it is revealed that the third child is a girl named Elinor.
As there are only posts about her older siblings Lady Maude and Lord James, I thought this might be news worth mentioning.