This guy is definitely not "showing off" his mommy's stuff, even his own son

[theking]

...was in the dark.

Buffett seemed humbled and quiet as well as practical and frugal....even though he was the richest person in the world at one point...

Yes, Warren Buffett's son, Peter Buffett, has stated he didn't realize his father was a billionaire until his 20s, discovering it when he saw Warren's name on the Forbes rich list and laughed about it with his mother, growing up in a deliberately modest Omaha home with public schools and normal routines. Warren intentionally raised his children without overt signs of wealth, emphasizing values over luxury, so Peter, like his siblings, was unaware of the massive scale of his father's fortune until much later.