Going to try to keep this really brief and unemotional.
Over Christmas I had a huge argument with my Mum over her usual insistence that women are domestically abused because they are "weak". This progressed into her telling me that she is not surprised that my unfaithful, physically, verbally, emotionally abusive ex treats me like he does, because I am so difficult.
I spoke to her today for only the third time since then and this argument came up. She told me that she had not said that at all - she did. That she had actually said something about me being loved and supported and I had completely took it the wrong way - she didn't. Told me I had called them both "Shit parents" and her inparticular "a shit mother" and had screamed abuse at them. THIS DID NOT HAPPEN. She haS big form for this, saying and doing shit things and then completely denying or changing it. I honestly think she believes it herself, convinces herself. Anyway I wouldnt allow it this time and pulled her up on it. Big tantrum ensued.
During the tantrum (on both sides I will admit) she out and out lied about how the argument had gone at Christmas and said that my Dad no longer talks to me or interacts with my children (shes right he doesn't and it was something that I brought up today) because I make him feel like a "child abuser"
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Apparently the reason I make him feel like a child abuser is because I intervene whenever he tries to discipline my dc - ie shout at them and drag them about physically. My ds has ASD and my Dad did not believe it and used to bellow at him, tell him off for the most minor pathetic infractions and this would trigger ds into meltdowns every time we went there. In the end I said it could'nt go on and would intervene in every situation where ds was being challenging to prevent upset. My ds has been diagnosed for 5 years, my dad has never read a book on ASD, never bothered to find out and I quite frankly makes it quite clear he doesn't believe it. Totally overreacts to everything involving both dc.
Basically when we visit he sits in the armchair in the corner and sulks, barely exchanges a word or look with any of this and as you can imagine this can be quite unpleasant.
I feel at the end of my tether. Again it has crept up on me. They used to cut me off for months at a time when I was younger, the most memorable being when I had 6 week old ds and my Mum recommended solids for him, I said it wasnt done like that anymore, she hung up on me and did not speak to me again for about 5 months. I had no friends or family support nearby and she knew this but just didnt bother with me over something so petty. Did something similar after dd was born too.
I never seem to notice until something extreme happens like today, its like I have this massive drip, drip, drip tolerance and then something happens and I look at it all and think "this is fucking awful!".
So anyway, I don't even know what I am asking and I am sorry its so long but I don't even know where to start with this. Do I confront my Dad about the "child abuser" nonsense? Or do I just cut my losses this time? Its all such a mess 
I have name changed as its obviously quite recognisable. Thanks.