My DS (7), and DDs (5 & 3) see their Dad, my XH, every other weekend in term time and an extra couple of nights in school holidays.
XH also has 2 DSs (12 & 11), from previous relationship. They lived with us when we were together, but now live with their Mum. He has them 3 out of 4 weekends, so 1 weekend a month has all 5 DC together. They also spend most of their school holidays with him, so all 5 for a couple of nights in school holds too.
When my DC go, and just they are there, ex and his gf seem to do a fair bit with them, take them to the park, bake, play board games etc. But when his older DC are there, they seem to be expected to the entertaining of little ones. This has previously been in the house or garden.
Today, I have picked my DC up from 2 nights of school holiday contact. When I got to ex's, DS started showing me a scab on his hand but ex rushed him out, saying 'Mum's waiting, tell her in the car, let's get this door shut before the cold gets OK in'. As we drove home, DS explained that he and DD1 had been taken to the park by ex's DSs, on their scooters. DS had fallen in a ditch on his scooter, while doing tricks with his bigger brothers, skinning the back of his hand and both his knees. DD1 and biggest brother had carried all the scooters home, while 11 year old helped DS, who was upset and bleeding. To get to and from the park, they have to cross 1 busy road with a traffic light crossing and 2 terraced side streets with lots of parked cars on both sides.
My DC don't play out alone at my house, I don't think they're mature enough to cross roads or risk assess situations. I don't think it's fair to expect 11 & 12 year olds to take responsibility for younger siblings. I'm cross that ex dodged coming clean about what happened. And I also feel a bit sad for DD2, that she didn't have anyone to play with because ex couldn't be bothered to go the park, so she couldn't go.
Would other people feel the same? And what (if anything) should I do about it?