Number to stars papa proved that Ellen was his daughter by showing the soldiers what item?

Annemarie's sister Lise, who'd been killed, had dark hair like Ellen's. He showed them Lise's baby picture, which proved he had three girls, and that one of them was dark haired. Thus, Ellen was safe from suspicion.

She saw that he was holding the family photograph album. Very quickly he searched through its pages, found what he was looking for, and tore out three pictures from three separate pages.

In her mind, Annemarie pictured the photograph that he held: the baby, wide-eyed, propped against a pillow, her tiny hand holding a silver teething ring, her barefeet visible below the hem of an embroidered dress. The wispy curls. Dark.