"Two of your twins?" repeated Mr. Martin, with a smile. "Do you mean to
say you have more twins at home?"

"Oh, yes, another set. Smaller than these. I wish you would see Flossie
and Freddie. Come here, Bert and Nan. This is my friend, Mr. Martin," he
continued, "and these are his children, Billy and Nell. They live in
Washington, D.C."

So that was what Mr. Bobbsey meant. At first, Nan said afterward, she
had a little notion that her father might have meant the boy and girl
were the children of General George Washington. But a moment's thought
told Nan that this could not be. General Washington's children,
supposing him to have had any, would have been grown up into old men and
women and would have passed away long ago. But Billy and Nell Martin
lived in Washington, District of Columbia (which is what the letters
D.C. stand for) and, Bert and Nan knew, Washington was the capital, or
chief city, of the United States.

"Mr. Martin came in to see me on business," explained Daddy Bobbsey. "He
is traveling for a lumber firm, and on this trip he brought his boy and
girl with him."

"They aren't twins, though," said Mr. Martin with a nod at Nan and Bert.

"I think it's lovely to be a twin!" said Nell, with a smile at Nan.
"Don't you have lots of fun?"

"Yes, we do," Nan said.