I spoke about this with Kathryn Ryan on the Radio New Zealand Nine to Noon show this morning, where I am a regular parenting commentator. What happens to children when they have to step into a caring role usually carried out by an adult? What is the impact of this on development? And at the other end of the lifespan, many children are taking part in the care of older parents - how does this affect family relationships? You can listen to my discussion with Kathryn here.