Mil has had a lot of access to my 2 dc (10 and 12) since they were born. They have regularly stayed with her for 2-3 days at a time in the holidays, or on weekends, and MIL has routinely babysat when DH and I have gone away for weekends etc. Mil has a very close relationship with the DC, is very hands-on and generous to them, and the dc love her.
BUT. Mil and I have never got on- she has never really respected my authority as their parent since they were babies and has often undermined me.
She is a toxic gossip (all of her conversational material seems to consist of gossip) generally sharing inappropriately private information or speculating about friends, family members etc.
If taken to account about anything, MIL sulks and acts like a victim.
Without going into details, MIL recently made some remarks/accusations about me to DH which have proven beyond all doubt that she has no respect for me. When I was away, she visited DH and said she believes I had stolen something valuable from her (I hadn’t!). She also told DH not to tell me about her suspicions.
Mil has behaved maliciously towards me many, many times over the years, but this feels like the final straw. DH was also outraged and is v much on my side, although he has previously attempted to defend MIL
The dc’s strong relationships with and obvious love for their DGM does give me pause, but AIBU to feel reluctant to let someone who is a) an inveterate gossip, b)clearly dislikes me and c? regards me as a thief to have unfettered access to my dc?