Замените существительные с предлогом "of существительными в притяжательном падеже:- the flat

1) the flat of my mother - my mothers flat, 2) the children of my sister Mary - my sister Marys children, 3) the letter of my friend - my friends letter, 4) the stories of this writer - this writers stories, 5) the younger daughter of my brother - my brothers younger daughter, 6) the house of his parents - his parents house, 7) the rights of the women - the womens rights, 8) the children of my sisters - my sisters children, 9) the car of my grandparents - my grandparents car, 10) the room of her brothers - her brothers room.