ETA I know Sirius will be along soon to mention Universal Credit though!
They will be spared from being moved onto the the strict requirements that UC has, for a while, as she has more than 2 children.
The 2014 MAC (Migration Advisory Committee) report that brought in the up to two chilren limit for welfare, that was mentioned in Parliament in the 2015 budget, is in
addition to the Welfare Reform Act that brought in the replacement income based welfare system called
*Universal Credit.
The 2 child limit will still be there for those that are not on UC yet, but those already on benefits and with more than 2 children, will claim the old legacy benefits until UC is ready to take them i.e. the Tax Credit benefit (don't have to work/work much, if they don't want to), ESA (get more money given to them than on JSA, so worth claiming instead of the JSA benefit and they won't be required to look for work, go on work experience, go to a work provider).
Nothing changes under Universal Credit for those that are on the present jobseekers benefit, but it will for the other claimants.
There is now a free childcare allowance for those that earn under 100k and there is no limit to the number of children that can be claimed for, but there is now a 2 child limit for income based welfare payments.
*Universal Credit is for claimants of working age and is replacing six income based benefits presently known as-
JSA (Jobseeker's Allowance); Child Tax Credits; Income Support; Working Tax Credits; ESA; Housing Benefit.