I'm 51 and live in Durham with DH of 20 years and DD (11). SIL (45) and MIL live in London.
For 20 years, SIL has been dismissive and rather offhand with me (which I've ignored), and recently told me she has loathed me since the first day she met me.
From the outset, DH made it clear his sis has emotional problems (big history) and is very self-absorbed. Families are what they are, so I made a big effort with her. Then both SIL and MIL reacted badly to my longed-for PG, with MIL saying that through my relationship with DH, I'd split up her family (she reeled off a list of complaints from SIL about my character). Since then, to appease MIL, I have considered everything with "allowances for SIL" in mind - I've cut her a lot of slack, been supportive in her crises and bent over backwards to make her feel included (even took her on hols with us). I've been sympathetic through the moods, mystery illnesses and accidents (usually occurring when she can't deal with things or can't get what she wants). I have turned a blind eye to her and MIL's manipulations and at times have put SIL's needs above DD's! MIL will do anything to keep her happy and has always expected me to do likewise. I wish I'd taken a firmer line because now, after years of it, I feel like a doormat to a petulant child:
Since we moved from London, SIL refuses all invitations to visit us (we have to go to her), and then, because we can't visit often, she and MIL imply that we marginalise her. She has been increasingly rude to me, seems to delight in undermining my authority in front of DD (and steering DD to do likewise) and acts with total disrespect to DH and myself. It's like a game she plays. She was recently very OTT affectionate with DD, making out she has been cruelly separated from her "special girl" - and yet in the 7 years we lived in London, didn't once offer to read her a story or take DD out (it used to be as if DD was her rival for MIL's attentions).
During a recent abusive tirade, she railed at me aggressively, mocking my role as DD's mother, then suddenly changed tack, ran for DD and sobbed hysterically on her shoulder (as if I'd upset her!) I had to just sit there and take her personal insults, for fear of upsetting MIL and the whole apple cart. (She was a b*h and knows she can get away with it in front of her family). I managed to placate her but now the dust has settled, I've decided I don't want to see her again for a long time - I feel too demoralised.
The thing is, she is hinting that she intends to be DD's mentor and confidante . She seems to think this is her right, irrespective of what us parents think. (She has told DD that when she gets sick of her mother, SIL will be there for her). She also insisted on taking DD's mobile number and has been sending her intensely "chummy" texts.
I feel sorry that she has no kids, but I just don't trust her to act maturely with DD.
Obviously, there's alot to this, but for starters, AIBU to want to keep SIL at arm's length from DD and keep our visits to London to a minimum? (DH is fine with this). Do I lay down boundaries/ground rules? And what do I tell DD (who is totally beguiled with SIL)?