Posting here for traffic. It will be long but don't want to dripfeed / leave out anything that might be relevant.
For background context: DH & I work FT. He has one teenager from a previous relationship and we have 2 preschool aged children together. Stepson is 50/50 between here and his mothers home.
Now the AIBU: Last year SS mum signed him up to a travel sport without discussing with us. Essentially he would have 2 training sessions a week (one on her day, one on ours) and a game / tournament most weeks. These games are minimum 2 hours drive away from our home. Whilst obviously we are happy that he is playing a sport, we couldn't physically get him to the training during our access because of our work schedules and needing to collect other kids from childcare and having to feed everyone etc. For a few weeks his mum collected him from our house and dropped him back but she was always making nasty remarks about how we were lazy and unsupportive. We took him to pretty much every game / tournament which often meant lugging the young kids along or my DH missing out on a full day with them if it was too far. After a few weeks his mum just stopped collecting him during our days. He also missed probably 50% of the training on her days.
There have been half-term and summer camps that stepson has been signed up for and that we have either paid fully for or contributed toward. Out of a total of 9 days, he attended 2 days of the camps (on our time).
This year his mum has signed him up again and the revised training means it is 75% during our access. We live a 30 minute drive from the training grounds. We physically cannot get him to one day of the training (50%) again because we won't be finished work, collected from school and daycare and home to feed everyone before the session starts. My DH told his ex that we cannot take him this day and to facilitate it (because she's being quite nasty again saying we aren't supporting and we are full of obstacles) we could swap days so that the access arrangements all change by 1 day. That would mean that she took him every week on Wednesday (the day we can't do) and we would take him each week Friday. She has denied this and said its unreasonable because she wants Friday evenings with stepson too. That's fair and makes sense but the training sessions go on until 9pm so there's not really much Friday left unless of course she wasn't taking him?
We suggested that we just have that arrangement during the sport season, meaning it's only half the year. That was a no go. We suggested we trial it for a few weeks and see how it works, that was a no go. She has suggested that she will collect stepson and bring him back on the Wednesday. Are we being unreasonable to say that no, that doesn't suit us? Midweek one or both of us are often working late at night and we don't want to have to go to the meeting point at 9.30pm to pick up Stepson.
YABU: Just suck it up and struggle so he can do the sport, even though it's less than ideal for the rest of the family.
YANBU: You have offered solutions and the other parent needs to compromise too.