OH and his Ex wife agreed to go halves on music lessons for DSD1 for one term.
Ex Wife then never paid so we paid the full amount. FIL then paid for a second term.
DSD1 had some Christmas money and we found her a second hand instrument which she paid for herself with her money.
DSD1 then didn’t do any practice on said instrument which was noted in teachers comments the first term we paid for and the second term FIL paid for and we said we were not paying for a third term because she was not putting in the effort needed.
Ex wife has now informed us that (somehow?) DSD1 has continued attending the lessons and the school are now chasing her for the money, we told her and DSD1 we would not be paying for them.
AIBU to think this is not our responsibility?