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
this boy's brother
John's parents
colony's inhabitants
sister's book
wolf's den
wall's paint
eye's color
statesmen's decisions
schoolchildren's homework
mouse's hole
woman's hat
box's contents
house's roof
tooth's cavity
story's plot