Употребите притяжательный падеж вместо словосочетания с предлогом of 1. the brother of this boy 2. the parents of john употребите во множественном числе : a calony, a sister, a wolf, a wall, an eye, a states man, a schoolchild, a mouse, a woman, a box, a house, a toorh, a story
2. John's parents.
calonies, journeys, sisters, wolves, walls, eyes, states-men, schoolchildren, mice, women, boxes, houses, teeth, stories.