Bought about by the unrest detected in many children born under that policy who now find that they, as working individuals, have responsibilities not just for their own parents but also both of their parents parents who probably have retired in their fifties.
This has resulted in one person who is having to maintain up to six others at a time when they should be married and starting their own family.
The bond between Chinese family members is unbelievably strong and it does take 'foreigners' a while to realise just how deep it goes. You join a Chinese family and you do not take just a wife, you take in parents, sons, daughters, grandparents, brothers, sisters, cousins, uncle, aunts, nieces and nephews.
Willy