Only my matriarch has that kind of money, she's currently got 939,000. She's got a greenhouse that generates thousands with each harvest, lives off the grid, and I've had her since I started Sims 4 (though I did loose months of play with her once).
Once each of her descendants ages up to child, they move in with her and live there until young adulthood. I had one Sim that moved out with no money for a rags to riches story, but most take a big chunk with them. Her great granddaughter took 300,000 with her when she moved in with Vlad. She also blows a lot of money on community lots and her bills are in the thousands.
