XH's family expect me to continue to attend all family events despite him leaving me (and having minimal contact with DD). They also think that I should see them separately from my ex?
I can't see there is scope for an ongoing relationship over and above handover meetings. For a start I think it would be confusing for DD, giving her false hope of a reconciliation. Then I think it isn't realistic for XH's new partner to be excluded from events if I am there, and I don't want to be there if he is with his new partner. I would feel like a glorified au pair attending with DD.
I don't know of anyone who has this kind of relationship with their ex in-laws - are they BU to expect me to continue as if nothing has happened?