Wow thank you all for taking to time read my rant and to give me such thoughtful and helpful feedback.
I agree that cancelling would be storing problems up for th future so I think I will go ahead with letting them stay.
The comments about my dad are very interesting. He is a committed catholic and I used to think that was why he didn't get divorced but I have come to see that there must be something more to it than that. Until I had DD I just assumed he didn't want to take sides but, since realising that if DH so much as uttered a tiny percentage of the horrors I had thrown at me on a daily basis (not that he would), I would happily march out with DD and live in the garden shed rather than expose her to such tosh, I think it isn't that simple.
So on some level I think DF is complicit in all of this. I remember being struck by the craziness that he is a brave man who risked his life to fight for his country but telling my mother to shut up when she was clearly damaging me was beyond him. I refuse to believe that she is nearly as scary as an army of argentinians trying to kill you... Although sometimes I think the army would have been a more preferable foe because at least you knew what they were up to!
I love the "did you mean that to sound so rude" comment. Genius. I will be informing DH that we will sprinkle that liberally around any conversation with my mother.
Fortunately DH totally sees what the bitter old boot is like. I think it was when she started telling him that I was very lazy, didn't work hard enough at school / uni and am basically wasting my life away doing nothing of importance that his hackles were well and truly up. She seems to use slagging me off as a way of bonding with other people ... Which is odd as most people find a mother slagging off her daughter quite repulsive; especially if you are married to said daughter so there's a chance you've decided you quite like her!
Sadly my brothers don't get it. They both conformed to what my mother saw as a worthwhile career (both in the forces) and wee both married and had kids by the time they were 21. I had the audacity to be self employed in a totally non military environment and to wait until the very old age of 36 to have DD! So, according to my mother, the sun shines out of my DBs' arses and I am the devil. Which is nice for me.
I tried talking to my brothers about it when my mother called me up the day before my finals at uni and told me that DF needed a heart transplant. This was not true in any way (DF is as fit as an ox). My brothers just said I must have misremembered the conversation. Y'know because that is the kind of thing you'd probably misremember isn't it? I often confuse "your dad's just nipped down the shops to get a paper" with " your dad needs a heart transplant." FFS.
Strangely, my nieces do get it. She is a controlling and judgemental old hag to them and they hate it. She used to delight in slagging me off to them (which they found confusing as i get on well with them) but they are now all over 20 and simply tell her to shut up.
I have no idea how to broach this with my father. I feel I should warn him that I am not going to take any more of her shit and he needs to rein her in or bring some of his old body armour up when they come to stay.
I think the fear, obligation, guilt point is a good one. That is exactly how I used to feel but I won't accept it any more - which, I suppose, means I have to prepare for the consequences.
One of my friends said to me that they thought my mother was very narcissistic. I know what the word means in the general sense but can anyone tell me what it means in terms of parenting? Or point me in the direction of a book that could enlighten me?
I will def read the toxic parents book.
I am so sorry to hear that other people have had similar experiences but it does make me feel less isolated and more like this whole mess is my mother's problem, not mine.
I simply won't let this shit get anywhere near my DD. Even if it is going to cause huge family friction, I'm determined not to let her be part of this cycle.