First of all, my parents would never have taken me looking at houses at that age. Second, if I, or any of my siblings acted like that my parents would insist that they hold our hand. We would never have been given the freedom to be in another room without them in that situation, much less on another floor. Third, a stern warning from either of my parents was enough to reel us in. Don't touch meant "don't touch". No matter how cute, discipline has to start early.
But I was also raised back in the old days of spanking. I can't say I remember spankings altho I know I got them. After that, at a certain age, a stern look worked. Kids want to know boundaries. They need to know boundaries.
"Time out" was decades away. <sigh>
I'll leave it to the reader to judge what works. Also, some children respond to different ways of discipline. Parents have to learn that. Most do fairly quickly. Clearly, The Little Couple has not.
Note to Bill: You aren't doing your children any favor by laughing at their antics (and in some cases - encouraging them).