Who's more stressed?

It's an age old question right? Is it the person who goes out to work or the person who's at home looking after kids? Admittedly this article focused on the 2 parents, 2 children scenario but it's an interesting read.

http://www.dailymail.co.uk/femail/article-1153566/Who-pressure-breadwinner-homemaker-Nick-Harding-wife-stress-test-.html

It does make you wonder though what a single parent goes through.... I bet their stress levels are double everyone elses. Penny, I'm thinking of you!