Certainly they both sit at the dinner table while things are being discussed. Both kids particularly enjoy math and money in particular(I think this is likely very common).
Most adults don't give children enough credit. The things they have learned in their short lives are mind boggling. They have learned at least one spoken language from nothing, reading and writing, fundamental math. Children's minds are able to comprehend very complex things, its the mind numbing things they have problems with.
At a young age(about 1yr old if I remember correctly) we took money they had received as presents and used it to buy dividend paying stock and purchase compound interest investments. Both of them understand what a dividend is, how compound interest works, how a company's value is related to its products, how value over time can change, etc etc.
Because they understand these things, they understand the dinner table conversations.
It is unlikely they have put it all together.
Do they compare themselves to other kids/families? Of course they do. I would guess every kid older than kindergarten has done so, and most before that. We have talked a few times about how when interest rates were high and you saw someone driving an expensive car you could assume they were wealthy but that current day that isn't the case anymore.
One of the banks here has a catch phrase "You're richer than you think.", when my kids hear that they call them liars. It makes me proud.