My exDP has two DC he hasn't seen for a couple of years. We used to have them the majority of the time and me and my DC miss them very much. He has no intention of trying to initiate contact with them. Since we separated 9 months ago, he hasn't seen our DC alone. He only wants to see them if I'm there too and they don't want to see him. They'll tolerate him on days out because he can hold the baby and I can be with them but they aren't interested in him beyond that and he's main pursuit is trying to win me back.
I would love for my DC to be in touch with their siblings but obviously that would be very difficult if exDP is still in the picture as his other DC would be upset that he sees my DC but not them. How would you approach this?