When couples split up, families move from one to two households. Poverty is a common outcome that affects children. Six out of ten lone parents are supported by the state compared to one out of ten couple parents. That's where most of the £50bn is spent.

In praise of lone parents
When Marriage Foundation was first launched in 2012, I was invited on to ITV’s This Morning show, whereupon I was ambushed by their agony aunt,