Замените существительные с предлогом "of существительными в притяжательном падеже: - the flat of my mother, the children of my sister Mary, the letter of my friend, the stories of this writer, the younger daughter of my brother; - the house of his parents, the rights of the women, the children of my sisters, the car of my grandparents, the room of her brothers.
My mother's flat; my sister Mary's children, my friend's letter; this writer's story; my brother's younger daughter; his parents 'house; the women's rights; my sister's children; my grandparents' car, her brothers' room