There has been a major security breach at the SuburbanHouse.
I had devised a sophisticated, high tech barrier to prevent Thing 3 from going upstairs. At first because we didn’t want him to tumble down the stairs, but now because we don’t want him getting into everything in the bedrooms and bathrooms. He’s famous for hitting the buttons on clock radios and inadvertently setting middle of the night wakeup calls.
He DOES like buttons! No doubt. Boy, I don’t know if that will work, but GOOD LUCK!! :)
This actually worked for a long time. But now he is able to climb over it like his brothers.