Grandparents did this.
Unfortunately, these days, parents can't afford to keep living near the grandparents (because home prices have gone up too much, or because the grandparents are in a dead-end no-jobs town).
Your options are to fix the housing market (By which, I mean, utterly destroy the value of existing homes[1]), or to make it possible for a single breadwinner to feed a family again (again, this is largely driven by the cost of housing) or to make due with the status quo.
[1] That's going to be hugely popular among demographics that vote. /s