Family wealth is the most common. That doesn’t mean “mommy and daddy gave me a house” as often as it means things like living rent-free on your parents’ property so you can save money, having them co-sign a loan, or cash gifts helping with the down payment.
The other thing is remembering that cost of living varies significantly. Even 25yo FAANG engineers struggle in San Francisco but there are other parts of the country where someone with middle class income can buy if they live modestly and are thinking along the lines of a basic condo in a non-luxury neighborhood.
