I wonder what they mean by other

Family values? Independent thoughts?

People are getting back to Stone age.. :-D

To me : Parent & Child 22.4% sounds alarming.. Almost 1 out of 5 are single parents. Something seriously wrong with family values.

On 25.8% single adults - depends on age group which was considered for the survey . Because Probably Many in this category are still waiting to find their right match. :))

D.i.v.o.r.c.e.
It is the same reason that there still is a housing market, although the American Market is starting to crumble because it is so artificially inflated..it's all about demographics...get ready for 1 in 5 people to be over the age of 65!
We Baby Boomers are gonna drag you all down with us when we go...right now we are just rearranging the deck chairs on the Titanic!