[notch656a]

Might depend. If you have grandparents that help I would guess the kid would do better. If the grandparents have bad medical issues that place a large burden on the parents, then the kids would probably get less attention and be better off if the grandparents were figuratively placed in the garbage bin. But I would wager on average you're correct, and I'd be interested in seeing some of the data to confirm it.

[prohobo]

There is no data because no one studied it, at least from what I've read.

We're pretty sure that multigenerational households lead to less loneliness and less strictly individualistic people than nuclear families, but it's hard to prove it without a proper study.

EDIT: Dealing with ailing grandparents is a very situational problem, but I think that effects nuclear families just as much.

[biomcgary]

One of the problems with boomer grandparents is that their average expectations around helping with childcare (i.e., minimal) are quite different than grandparents of the past. Due to the ongoing drop in incomes, boomers (and gen Xers) are more likely to be financially supporting their gen x (and millenial) kids than vice versa, which means they are less willing to "earn their way" with childcare.