We tolerate each other really. Found out a few things lately that have made me realise that she doesn't really like me.
She told DH to leave me when we'd had an arguement just before we were due to get married til he told her I was pregnant and then that was that then....she changed her tune and he HAD to marry me.
She hides bibles on the kids bookshelves (she's deeply religious and while I have nothing against religion, she knows that I don't like it thrust on my dc's!)
She asks how I am, and if I say anything except that I am fine I get the 'well you CHOSE to have so many children it's your own fault'
She went through a phase of coming round and bullying me into letting her have the kids (only the ones she wanted at the time though!!) on a saturday so I was only left with sundays with them and I had to do all the baths, uniforms etc, and no time for fun with them as DH was at work. After a few weeks my eldest ds said that he overheard her talking to a friend at a fair thing she'd taken them all to...apparently she likes to take the children out as I do nothing with them
Course I don't.... I just sit on my arse all day don't I?!?
Trying to support our local community I signed me and the kids up for the carnival parade and did the costumes etc. She tells me it's pointless and doesn't know why I bother.
She used to try and do my washing when she came round til I started hiding it!! That's my pet hate is anyone else sorting my washing!!
She wouldn't let me attend DHs nans funerals (lost both in the space of 6 months
) At her own mothers funeral I was heavily pregnant and she said it would be better if i was just to wait back at the house to let the guests in for the wake and uncover all the food, make the tea etc. She then proceeded to lock me in the dining room with the priest and the undertakers to try and bully me into having my kids christened and tell me how evil I am for not having them christened yet. (I plan to do this when they are old enough to make their own choices!) Then when her MIL died (dhs other nan) I was told I couldn't go to the funeral as I wasn't family.... then proceeded to have a go at me that she'd never got to meet dd2 before she died.
She only favours some of our children. And it is obvious. DH was going to take me away once (we have never been away even overnight...even when we got married!!) and then she ruined it by refusing to have the kids, saying she couldn't cope with them. Sometimes she will offer to have some of them if I need to go to an appointment etc, then says that theres no rush and then when we get back complains we are late and she has to go out etc.
The biggest thing we hate is that she invites all the family round for big dinners and goes out with them all etc but we never get invited. We only find out by chance about them, like it's all a big secret.. We have however been invited to her dds 30th party tomorrow, which I am dreading big time (suppose its a chance for her to show off mt dd3 seeing as most of the famiy haven't met her yet). I will just hide in a corner while everyone gets my childrens names wrong and forgets that it will also be MY 30th birthday very soon....She sent an invite for it at the weekend. So I have to drop everything this week to attend. DH is at work tomorrow, she put on the invite that she will save him some food.... 
She bullied DH into landscaping her garden for her then kept changing her mind. He told her to get someone else into finish it. She won't and continually has a go at me and him about it.
When me and DH had a bad patch last year, she suddenly started coming round all the time and 'supporting me' saying DH had been an idiot with what he did and to leave him to it etc. Then I found out from DH that she'd only tried to do that so she didn't have to say she was going to lose her grandchildren. She was just trying to keep me sweet. She promised she would take me and the kids on holiday this year without DH cos of all that had happened. (long story but me and DH are trying to make a go of our marriage again now...she dispproves)
She buys presents for all the kids when its one of thems birthday which I really don't agree with but I suppose it's harmless enough really and certainly not the worst thing...
oh I could go on forever.... 