You actually just keep making excuses for your situation - your wife CAN work, you just have to find a way round things so she can.
If there is a 16 year old child in the house (who, unless she stays in further Ed, you will lose the child benefit for in Sept so furthering your money worries) who IMO is old enough to babysit any younger siblings there may
So, now it's the fault of young mums is it that the CSA say you are not entitled to any extra cash?
It may sound harsh but it's called life. Many 100's, actually 1000's, are in the same situation as you but they get on with it and find a way without blaming other social groups.
You can help yourself, you just need to try to