My daughter looks after two children after school and the parent has asked us if we can drop them off at another childminders house twice a week who works until 10:30pm. My daughter walks to school so she would have to fetch them and bring them back here until I am back from another school run with the car. I would then pick the two children up from here and drop them off.

I think we should still charge her for collecting the children from school but do I charge the parent any extra for petrol? It will probably take me about 3/4 hour round trip with the traffic.

Has anyone ever done this before and if so, what did you charge?