[header] How to tidy the house without your parents knowing [title] Find an excuse to get your parents out of the house. [step] Tell them that there is a sudden need of groceries, or that your teacher wants to talk to them. Something like that, but an excuse that will keep them out of the house for about 20 minutes. 
That will leave you enough time to tidy everything up. [title] Start with the room your parents see when they come in.