My two children have turned out to be good at an expensive sport. I don't do this sport at all and my ex does it occasionally, recreationally and not well. The kids have won a coaching scholarship - 10 Sundays, full coaching for a big long day. There is still a cost and it is quite significant and we have agreed to share that. Sunday is always his day and initially we agreed he would go. It is a difficult drive needing a decent vehicle - he took the good car and I have an old banger. Now he wants me to pay for half of the fees to allow him to take part - this is not necessary for the kids. All that is required is transporting them and waiting around. Of course he can take part if he wants, but I don't see why I should have to pay $350 for his recreation I have suggested that I pay towards petrol money instead or else we will do 5 Sundays each. He is having a tantrum.