I appreciate everyone's responses. I spent yesterday talking with the solicitors, explaining that the situation they presented in court wasn't entirely accurate, and the position that what was actually the solicitors decisions in court are now leaving everyone in. Then speaking to the IL's about how we can make this work and move this forward in the best interests of all the children.
Solicitor said that it really was a case of all her other demands were refused, so the court agreed with this one, but the cafcass officer made it clear that they were not on board with this for the long term, and expect it to be changed with the enforcement order. Essentially, they said nobody believes she can follow the order, so it will be back in court much sooner, although if somehow she does manage to follow the order, DP can apply for a variation sooner. Either way, they don't think it will be six months. They thought three would be more likely.
They expect her to turn up after contact has ended, in which case I would be back at home to call the police. If she tries to just walk in when contact is happening, then he is to calmly ask her to leave, contact the solicitor, and go back to court.
I would be really uncomfortable with the idea of hiding in my own home and breaching the court order, especially as DP has never breached an order.
So after a long night of discussion, the compromise is Sat is my house, Sun is ILs and Tues (My DC are out on Tuesdays anyway) is my house. If my DC are sick, or I am, or I just want to stay at home, then DP will find an alternate. The ILs won't be in the house on Sundays. They have had enough of all her drama, but as well as that they haven't seen his DC in over two years, and we're all aware that it could be too much too soon if everybody is there. It's not that they don't want to see them, but they don't think it would be in the DC's best interest at this point.
As for residency, it's a difficult one. It's not that he, or even I, don't want residency, but we don't want to diminish the ex's importance and input as their mother. It's probably a bit naive, but we just want everyone to work together and move forward. It can be done, but only if everyone wants the same thing, and at the minute, they clearly don't.
And yes, while this is DP's problem, and his restrictions, , I feel that blended families are difficult anyway, and a lot of making them work is based on compromise. I feel that we have to act for all the DC, not just me acting for mine, or him acting for his. I think that we both kind of forgot that for a while, him because of the excitement, and me because of how I was feeling. While I know my feelings were perfectly valid, they are my feelings, and I think it might be a little selfish of me if I let them override everything else. When we spoke with my DC, they were completely on board with the idea. My DD said that it's not forever, it's for now, and it's going to make things easier for his DC to begin with, so we just have to go along with it.
So we're going to go along with it, and see how it goes. I also told the solicitor to make sure that in the next court, they do mention exactly what was done to ensure that the DC were comfortable and happy.