Maybe I've got this wrong but I thought the role of godparents was to oversee the proper Christian upbringing of children, meaning in practice from what I've been able to see that they are extra aunts and uncles who give presents at birthdays and Christmas. I wasn't aware that the responsibilities extended into adulthood.
I never had godparents myself as I was baptised as a baby into a dissenting (Methodist) tradition so I really only know about them from young Anglican friends in my childhood. I certainly didn't think there were any reciprocal, non-spiritual responsibilities for the godchild.
Last weekend, in Rutland, the first statue in Britain of the late Elizabeth II was unveiled.