I agree with you MollieO, when Christine and Sharon were talking about how Sharon wanted her children to understand that her dc could work to earn a house like theirs, Christine said that her DC might not be able to earn enough to have as much as they have now.
I think you're right, they can learn lots from each other and Christine and Ken seem to be very open minded and gracious tbh.
They are all lovely and very non-judgmental about the other's situation tbh.