Ok, so just an update for anyone wondering

My Mother asked for a more accurate due date as with her work she needs to give plenty of notice. So here is what I said:

"The scan showed Bubs 1 weeks less far along as to what I think I am. I could tell you a date but as you have had 3 children you are aware they rarely ever come on schedule, therefore I would hate for you to book time off to come over, and I go 2 weeks overdue and you miss seeing bubs. PLUS everyone else has said they wanna come too, and I have no idea where I am going to stick everyone. As this will be our 1st, I think you could understand having 5 Parents staying for the 1st few weeks of our Bubs life will be quite stressful, so I don't think I can have you all stay here."

She then said:
"I doubt your father would want to stay there while I am staying there." (so she automatically assumes 'she' can stay and everyone else works around her.) and "I am looking at coming for 2 weeks"

So I said:
"That's the thing, if you stay for 2 weeks, then DH's Parents do, then my Dad and Step Mum do, that's 6 weeks all up of non-stop having people here. I will end up wanting you all to leave, and I would prefer it to be a positive experience. And as I can not have you all stay at once, and I don't want you all coming at 2 week intervals, as that is not fair to the others to have to wait until the parents before them get to come over, that maybe everyone can come when they want, but get their own accommodation. I know it will be expensive, but I have no option. It's fair on everyone then."

Well, I then got the silent treatment from her for about 5 minutes (on the phone, gotta hate that, but I knew it was because she was annoyed, and I refused to fill her silent gap. So I told her I had to go, and all of a sudden she was talkative (I guess she sensed I was annoyed, and probably was scared I will tell her she can not come at all but I left anyways.

So that brings me to now. I think I need to explain the situation to them all again, and make it clear that they are not to be annoyed at us (as I fully agree it is harsh to go interstate and have to pay for accommodation) but repeat my reasons for it, and explain if we still lived over there things would be different. Fingers crossed this all works out. I am now angry that we look like nasty people to them, when we are being realistic, at least I hope that's the case