Comment by rbecker

It seems what you consider odd enough to require a citation depends on your political orientation. Citations for the original claim:

https://pdfs.semanticscholar.org/0e3d/640709c889472858054c8f...

https://www.brookings.edu/opinions/are-children-raised-with-...

https://www.apa.org/topics/single-parent

https://www.bbc.com/news/education-47057787