How do our cats get out when we don’t want them to? Mostly, I think, by stealth. You open the door to get the mail and the cat sneaks out. Happens a lot.
But here, without the use of opposable thumbs, the cats engineer an escape via the kitchen window. Well, one of them does. The other needs to hone his skills a little more.
If at first you don’t succeed, get your brother to do it! LOL
They are quite clever, when it suits their purposes. What always amazes me is how effectively a cat can hide. If my cat doesn’t want to be seen, she will be effectively invisible, until she’s ready to be found.