Im not sure about finances I guess they are well off enough but I know raising 4 kids will be expensive.
My food bill (including school dinners) for 2a 2c is £150 a week. So Id say she will easily be that or more. I was £160 in JD Sports for my pre teen today
(no shoes!!) My pre teen will eat an adult sized portion now and probably snacks more than I do aswell and is built like a rake. If we go out for a meal its 3 adults and 1 child meal too which pushes the price up.
That house will cost a lot to heat / electric but they may have put a decent amount down on it, if Ash had half the equity in the family home and whatever Wingdingaroo had to put down. Mortgage may not super high.
If hes dropping £2k on a bag for Xmas theyre not skint, unless its all on credit.