Like a redheaded stepchild...?

We went on a playdate today. The other two families have adopted and biological children and the topic came up; I finally learned which were birth and which adopted for the Freeman clan; I already knew for the Mabes.
At dinner, the kids were asking about adoption.
"Is James adopted?" asked Madeleine.
"Yes, honey, he is," I told her.
"I thought so!" declared Dale. "With that red hair and all those freckles!"
"Sweetie, Mrs. Freeman has bright red hair and freckles, as well."
"Maybe she's adopted, too," he answered.