Stretton by Henry Kingsley

Old Mordaunt, of Mordaunt Hall, used to say that his wife always had twins. When this statement was examined, you found that Mrs. Mordaunt had but two children--Johnny immediately after her marriage, and Jemmy twelve months afterwards, yet when the petrified spectator asked, in undisguised alarm, which was Johnny and which was Jemmy, the problem used to be solved by saying that Johnny was the fatter. But, then, neither of them was fat.

One--the elder--was broader, and less symmetrical than the younger one, James, more commonly called Jimmit. During the holidays, part of which young Edward Evans spent with his Aunt Eleanor, these two youths were frequent guests at her house. She pronounced them to be entirely similar, and utterly devoid of character. In which opinion she was not wholly right.