Right, your brother should not get married or enter into a common law partnership (live with a partner for 12 months or longer in a relationship) if he wants to keep his dependent status.  It is better for him to remain a dependent and land in Canada as a PR.  After that, he can return to home country, get married, then return to Canada and sponsor his spouse.
	
		
			
		
		
	
				
			 
	
 
	 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		