Two years ago an opportunity for a secondment to the US with DH's employer came up. DH is in a senior global role so it's fair to say we did have some say in this. Our DC's, DD was 13 and DS was 11 at the time. We knew it would be a tricky time in their education to move them, however we felt strongly that this was an opportunity for all of us and we took it.
However DM, and we've always had an antagonistic relationship, was distraught. This relationship deteriorated after I got married. She has had problems with every decision I have ever made in my adult life so I was only mildly surprised, at her response when she learned of our decision to move to the US. However, I was surprised by how nasty things have became. Now the situation between us has gone from bad to worse.
I am the eldest of 4 children, DM is very much a matriarchal figure, and DF who is essentially a quiet man just let her get on with it. She gave up working when I was born and we have been her life. I was the first to leave home, travel, meet DH, get married, have children, and at each one of these incredibly momentous stages of my life my DM and I had disagreements for one reason or another.
Twenty years ago I met DH overseas, we fell in love and he moved to the UK to be with me. It took me a long time to come to terms with the fact he loved me. It's so damn hard to believe even now, and he still tells me everyday 
DM's response when I told her I'd met a man and he was coming to the UK; "Oh no". When she first met him; "I think you need someone who is less high-powered". She hated the fact we lived together but when we got engaged and I phoned her with our happy news?... "I don't like you living with him but I never wanted this" - and we'd been living together over a year [hmmm].
DF was always a remote figure, he worked long, long hours and I can't recall him ever engaging with us very much as children. However, my relationship with DF has improved in adulthood. I think this is, to some degree, because I was the only one of us to pursue a career in the same field, and also we tend to think alike. He still will not defend me against DM, and to some extent I can't blame him because she lashes out with horrid, spiteful words that I struggle to believe she means it.
I did go and visit my parents on my own, against DH's advice, before we left. DM decided to air her feelings while we have were having lunch in a busy restaurant. I was a humilitated soggy mess and when DF attempted to defend my position DM turned on him. I desperately wanted to drive straight home, and not stay as planned, but DF pleaded with me to stay.
Prior to us leaving my parents and I had limped along with minimal contact, in the last few years we'd seen each only a couple of times a year. It was always our responsibility to go to them, there was always a reason they couldn't come to us.
So two years ago when I told DM we were possibly going to move to the States for a couple of years she seemed to dismiss it as something that 'may' happen. Two weeks later we had a discussion on the phone, once it finally dawned on her we were likely to be leaving in the next few months, and she became billigerent. Things deteriorated from there.
I've had very little contact with any of my family since we've been here in the US. Where I'm most like DF my sister is most like DM and her critical, disingenous smile, even on Skype, puts me on edge. I'm an emotional coward and I've basically avoided contact with them because I know in their eyes it's all my fault and it's something I just don't want to confront.
To cut a long story short, now we've made the decision to go home after two instead of three years and I know I ought to let my family know we're going home, starting with DM. But I just can't bring myself to do it. I know my DF's health is deteriorating and DM would like some help so the fact I don't want to makes me feel so desperately guilty.
Honestly, I envy my friends who have those wonderful mother/daughter relationships with their DM's, where they are on the phone every other day, and the genuine, beautiful love that shines when they speak of them. I really do 