Good pranks to pull on my cuzins?

kk so im going to NC (outerbanks) and theres gonna be 11 ppl... i wanna pull pranks on my 2 boy cuzins... going into 9th grade and 6th grade.... im 13 and going into 8th grade... what r some good pranks tht i can pull wen theyre sleeping or r out of their room? annythign tht u can give me wood be uber appreciated... nothing damaging to the property as we r just rentin the house... TY