When I was much younger, I'll always take my mum's phone when she isn't looking to play games with it. In the event that she wants to use it, cannot find it and asks if I have it, I'll deny having it(play dumb) and even proceed to help her look for it. During the search process, I gently replace it from where I got it and then pretend to have found it lying there the whole time.
Kids put up so many smart yet funny attitudes that you'll be surprised at how they could come up with such.
Some funny things we always do when we are kids and we always think we are smart though not untill our parent catches us up with our smart tricks. Lol 😂 funny stuff as a child