Right, just want to get a range of opinions about this...
DSS wants to start Judo lessons on a Saturday. He already does football on a weekday evening, which DH pays for, buys all kit and takes him to. However, if DH can't make it due to work, or the matches are on weekends when DSS is with his Mum, he ends up not going at least half of the time.
So, for two of the Saturday sessions it won't be a problem as DSS is with us from Friday evening. DS has swimming lessons on a Saturday morning so will take both boys out first thing, DSS can watch DS swim, then they can go on to Judo and DS can watch DSS.
But on the third weekend, DH picks DSS up on a Saturday morning. The judo session starts before pickup time, and DH can't collect him earlier because of DS's swimming lesson. DH has asked his ex to drop DSS at Judo and he will pick him up after swimming. Ex is refusing and saying that DH should collect DSS before swimming (it isn't on the way). This would mean getting DS out of the house before 7am, and as ex is invariably late, would mean DS being late/missing his swimming.
We can't really afford it anyway - we would have to cut back on something else (God knows what, these days) but to have to pay for lessons knowing that DSS will only get to about half of them seems a bit mad. Or is the whole thing completely petty?