the only thing to blame is our own toothless system for not recognising this issue for the folly it is. These people laugh at the system and the people who pay taxes. The welfare state was not brought in with this scenario in mind.
...What will happen about it? - nothing, that's what - he will get his larger house and when the next bl**dy kid is born the midwife can slap it on the ar$e and say "congratulations you've just given birth to another dole bludging car thief"