The work of Family First is to act as a highly important critique to government policy, advocating on family issues and providing a voice for families that have had injustice inflicted by the government. They are as much a charity as Barnardos [registration CC21844] whose website has a "Speaking Out" section and home page currently pushes for legislative changes to turn schools into restaurants.
It seems the Charities Commission is one of the new weapons to determine what the government deems to have public benefit, and what it doesn't. When the government starts making selective judgements like this, it is no longer "for the people, by the people". The public cannot determine what is in their interest says the government.
Welcome to the Nanny State.
Article: Family First Muzzled ~ McBlog
Related (Leading Edge Blog): Family First not the first, probably not the last ~ The Leading Edge