While I understand the difficulty and cost of taking care of a disabled family member, the government should set some kind of limit - £42K is quite a substantial amount of money. Give individuals some kind of cap on benefits independent on the number of kids you have. That would encourage people to better manage their family and finances.
Seems like they are trying to keep up with the Jones so to speak - no hand me down's for the children, Wii, DS, SkyTV. It's teaching their children the wrong thing.
Change in government or policy could leave them SOL one day. With articles like this becoming more prevalent, the time could be sooner than they think. That huge UK deficit could be on its way to being resolved quicker if they would cut off or decreased ££'s to people like this. Money is going to run out someday with people like this having babies left and right.