I have told my awful PIL's story on here and had a lot of support because they really have said and done some terrible things to us.
No doubt my MIL would tell a different story, in which I am the bad one. In fact she has, many times, so often that I think she believes it herself now.
But I still see and get along very well with two of my ex-partners families, one almost MIL even giving my LO money when he was born and saying "well, I was almost his grandma wasn't I?" It had been thirteen years since I split up with her son but even so, she still feels we are part of the family in a way.
There are awful MILS and DILS and SILS because some people are just awful. Genuinely awful DILS probably go on to become awful MILS in turn.
But you can take just a small example of what my MIL has done: Three days after our son was stillborn she argued with me about the time of his birth, demanded to know if we were planning another baby and asked if it still hurt to give birth if your baby was already dead. Then she accused my DH of sounding abrupt on the phone the day before our sons funeral and threw a tantrum because he didn't sound happy to be speaking to her. She hung up on him. Then when our premature daughter died she told us it was okay to have a picture of her because "She doesn't look...well she is still family I suppose." She then asked for some photo's of our daughter, we have only a few, and then promptly lost them before finding them again "in a box of rubbish we were throwing out." She rang me six weeks after our daughter was born, on what would have been our stillborn son's first birthday, to tell us how excited she was to be having her first granddaughter the following day (SIL by c-section) and then when I pointed out it was our sons birthday and that this would be her second granddaughter she said "Oh well I forgot about that" and went on to justify herself by saying her friend said our daughter didn't count in the same way because she was dead. She finally went on to ask if our daughter had been born with all of her face or not (she was premature and only survived for a few hours and MIL was looking at a picture that clearly shows all of her perfect and beautiful face at the time).
Then add in the way they have effectively stalked me, calling me on the phone up to 17 times in one day, following me home from the shops like kerb crawlers with me walking and them in the car, watching the house, lying about me to other people and so much more.
Compare that to what I have done, which is to try and ignore all the nasty comments about my children to keep the peace before finally reaching the end of my tether after the face comment and asking her to stay away from me for a few weeks to give me the chance to calm down.
That's what started the stalking episodes. I was given less than a day to calm down before the hysterical phone calls and letters started and she turned the whole thing on its head and became the injured party in all of this. She honestly believes that it's all me and that I am a bad person and she just wants us all to get along.
I wrote back to her three times, the first very upset and trying to explain what it feels like to loose two babies in less than eleven months and then have comments like that made to you. The second was an angry one and I called her a selfish and devious person who manipulates people and holds her entire family to ranson with her hystrionics and threats about a mental breakdown. That's the one she shows people to convince them I'm a bad DIL. The third was a bit of both upset and anger and tells her not to write again because I will return the letters unopened.
And that's it. I spent eight years trying hard to get along with her and feeling more and more taken advantage of and bullied by her. It's been two years since the 'face' comment and my request to be left alone but in those two years she has continued to behave badly while protesting her innocence.
The last time I spoke to her, in March this year, she called me a bitch and said she wished I had never met my DH. Then she sent him a text to say I had been cruel to her (I hadn't, it's a miracle I have kept my temper but I have never spoken to her like that) and she told him that she loves me and just wants us to be close.
At Christmas they had disowned us both because we had dared to spend two hours having tea with his sister.
But she genuinely believes that the problems are all down to me. She has gone from admitting she said the things and apologising (under pressure from DH and only after insisting to my face that she already had apologised - bare faced lie) to insisting that she would never say anything of the kind and that I had made it all up. Despite the fact that there were other people in the room who heard her say them.
I wish I had PILs that I could get along with, and I tried with mine for a lot longer than some DILs would have. So there may be two sides to our stories but I think on the whole she has behaved by far the worst of the two of us.