It says they get £170 a week in child benefit and he earns just under 50k so let’s say 58k a year
If they spend £300 a week on food that’s £15,600 on food alone, which leaves £42,000 for everything else which if they have no mortgage is doable I guess but if they go on a holiday abroad once a year that’s got to be costing £5,000 easily and if they use hand me downs it could still work.
It does seem a bit suspicious he earns just below what he needs too to keep receiving child benefit within his own business