Sentence:  "I wish we were back in Tenth Street. But so many children came...and the Tenth Street house wasn't half big enough; and a dreadful speculative builder built this house and persuaded Austin to buy it. Oh, dear, and here we are among the rich and great; and the steel kings and copper kings and oil kings and their heirs and <WSD>dauphins</WSD>.nb..." 
Meaning of the word marked with <WSD> tags:  (allegorical) An eldest son.