I never wanted the classic tense relationship with MIL but it has gone that way. Been with DH for 15 years, 3 DC, things started to get worse when we got married (she threw multiple strops about genuinely tiny things and then refused to speak to us on the day at the reception). They fell off a cliff when we had DC. She arrived 3 days after DC1 was born, opened my gifts when I was asleep, constantly took the baby off me, snatched my expressed milk, woke her up from naps etc, it was pretty awful and DH was bloody useless - it's taken years for me to get over some of it as I lost so much respect for him. There have been years of things happening now, and I won't try and write them all down. I also know I must have done things that upset her (though not deliberately), I'm not saying I'm perfect, but I really have tried and tried and tried to just all get along and have things be nice between us all. It has worked to the extent that things are outwardly okay, but there are still ongoing battles.
So I've also done a lot of soul-searching about why this has happened and continues to happen. I don't ever have problems with people really, never argue with colleagues / friends / my family. It is this particular relationship that is incredibly tense and I've been trying to unpick why. I am so jealous of my DH and how easy his relationships are with my parents (who have had no privileged access to us / DC or anything - honestly), they just accept him and us as we are and are generally happy to see us happy.
Could it be because I feel like she is always trying to cross boundaries and challenge my 'roles'? So, I have no problem at all, in fact I really wanted things to be nice, in terms of her being my DCs grandmother - I'd love that to be a really close relationship. But nothing ever seems to be enough, she always wanted alone time with them from when they were born, and for me to leave them overnight etc even though they were breastfed etc. She complained so much to DH about feeling 'unwelcome' after visiting us so soon after birth, inviting their friends to my house and then taking DH out to the pub while I sobbed into a breast pump etc. I couldn't have made her 'welcome' unless I'd just left I think. It felt like she wanted to pretend I didn't exist once I had given birth.
Likewise I want DH to have as good a relationship as possible with his parents, but MIL always wants to make their relationship more intense than it is. She calls him multiple times a day, wants to know every detail of our lives and has something to say (often a complaint) about everything we do. The clubs our DC go to aren't right, their hair needs a cut, we should move house - etc etc. I feel like she wants to be DH's number-one influence but they aren't even close (from long before I was on the scene). She also does a very strange (to me) act around him where she plays a kind of pathetic/ helpless act and needs all sort of help from him. This makes me sound horrible but I can't describe it any other way.
TLDR - could my discomfort stem from MIL's determination to play a wife/ mother role to my DH/DC rather than a mum/grandmother?
From my POV, she has done some appalling things to me/ us over the years but I'm trying to keep the description above as objectively fair as I possibly can!