Rake lock pick
This obviously looks like a key, but what kind of key has a handle like that? It looks like you could cut yourself if you mishandle it. What’s even weirder is that the OP found it in the laundry. Could it be a part of the washing machine that fell out? If so, what would this mean for the machine?
Turns out that it was indeed a key, or a rake lock pick to be more specific. Thieves use this kill to gain access to houses and buildings. With that in mind, why was the key in the OP’s laundry? Time to interrogate your kids, OP.