Sorry :( My little boy is 3. I haul my machine downstairs when I want to sew so I can keep an eye on him. Every time I use my machine I always check all the settings lol. Even when I get up and sit right back down. He is so quick. I am sure like your nephew. I turn it off. And unplug it both from the machine and the wall. Those little guys are quick. he has played with my machine more than once and I come back and start sewing only to have an immediate mess. Just rip it out and restart. It happens to all of us with little ones