“The children's carer has a direct and personal interest in enforcement which the Agency, however good its intentions, does not. Even in benefit cases, where the state does have a direct interest in enforcement, it is not the sort of interest which stems from needing enough money to feed, clothe and house the children on a day to day basis. Only a parent who is worrying about where the money is to be found for the school dinners, the school trips, the school uniform, sports gear or musical instruments, or to visit the 'absent' parent, not only this week but the next and the next for many years to come, has that sort of interest. ” 48. It follows from this analysis that rather than considering who had (in legal terms) parental responsibility for S, and effectively using that as a proxy for being the person with care, the tribunal should have focussed on who was providing the hands-on care or the “immediate, short-term and mundane aspects of care” (R(CS) 11/02, at paragraph 19), bearing in mind that “child support law is concerned with maintenance and the costs of bringing up a child are more related to the aspects of day to day care as I have analysed it than to the longer-term decisions about upbringing” (R(CS) 11/02, at paragraph 24). As I postulated at the oral hearing, it is about who puts food on the table, washes the child’s clothes, deals with the letters from school and reads a bedtime story. 49. It follows that I conclude that the First-tier Tribunal’s decision involves an error of law. It was wrong in law to conclude that “day to day care for the purposes of the Act means legal responsibility for the welfare of a child”