HackAttack
It was - I actually had a thread about it at the time (in 30 days) and MN unanimously agreed that they were being unreasonable...
However, In fairness to MIL I probably did come across as uncommunicative/rude but I was under immense stress due to being heavily pregnant with no choice other than to live with them if I wanted to live with DP and felt completely out of control of the situation.
It got to the point where I was so cross and frustrated with their inaction/delaying that I didn't feel comfortable being around them other than when absolutely necessary in case I snapped. I was on the verge of tears constantly and struggled to make anything more than brief conversation with them. I was a woman on the edge and it was making me increasingly irrational and me and everyone else miserable. I can see in hindsight how badly behaved that made me appear 
The house is tied accommodation linked to DP and FILs employment and FIL is now retired, they always knew they would have to move out once he did and had planned accordingly. They were just reluctant to actually follow through on those plans! whether I existed or not they would still have had to move eventually. The pregnancy wasn't exactly expected and had I not been pregnant I would have left them to it for as long as they needed but it became clear very quickly that it would not be realistic for them still to be there once the baby arrived, and also that DP and I now needed more privacy than MIL was prepared to give us.
In reality they actually had six months to get their head round moving and start packing things up but buried their heads in the sand and just didn't do it, and instead started completely unnecessary improvements to their new house leading to a 3 month delay in them actually moving and my due date getting closer every week. They weren't being nasty just disorganised and couldn't contemplate just how long it would actually take to go through a lifetimes worth of stuff. In the end there was a huge row between them and DP and from that point they spent the next 3 weeks moving out one car load at a time. It was excruciating.
They certainly aren't banned from the house, they are welcome any time I just want them to knock and announce themselves in case I am breastfeeding or generally cavorting around naked as one is entitled to do on Mat Leave if one wishes FIL does actually still turn up every day to 'work' bless him but due to complete lack of social awareness and personal boundaries has been asked by DP to try and stick to the kitchen if he does come in the house rather than wandering round the house. MIL hasn't been back once since she left.
Also turned out MIL thankfully didn't have cancer after all.
I like to think i'm not actually a horrible person but it was a horrible time and I can see how from another point of view I am a very badly behaved DIL.
I just hope I can fix it.