Origin of foster sister
Examples from the Web for foster sister
And no company had she but her foster-sister, and an old woman who had been her nurse.The Red Romance Book|Various
In a few weeks my foster-sister was taken into the house, and placed under the tuition of my governess.The Blue Jar Story Book|Maria Edgeworth
I returned home, to the house of my foster-sister, where I remained until my departure for Brittany.The Casque's Lark|Eugne Sue
In the baron's family she was treated somewhat like a second daughter, for she was Jeanne's foster-sister.The works of Guy de Maupassant, Vol. 5 (of 8)|Guy de Maupassant 1850-1893
Among other things they sought to entangle him with a young girl, his foster-sister, but his cunning saved him.