More specifically my mother (my dad died many years ago). She's nearly in her 80s and seems to enjoy stirring up trouble.
For example - a month ago I mentioned to her that I'd be working extra days over Christmas, as my work has announced redundancies looming. Since then she's been desperate to mention to my siblings (she loves to gossip) and creates difficult situations. For example 'don't you think you need to tell your sister, as you probably won't be able to afford to go to her wedding next year when you lose your job'. My response is that I want to keep it private until confirmed, I don't want to discuss. To be clear - I was very clear with her a month ago that I didn't want to discuss with anyone, I'd only mentioned to her as I wouldn't be around much at Xmas.
She says things with the intention of riling, for example she'll complain to one adult daughter about the other, always gossiping. Or she'll sing the praises of one child and their wonderful life, knowing full well that it would be uncomfortable to the other, particularly when it's a tricky subject 'oh her baby is wonderful' when the other just had a miscarriage.
Fortunately my siblings and I are generally aware of her nonsense, though one (her favourite) seems to be her defender 🙄
Yesterday she asked me if when I'm telling my dc that I may lose my job, as they'll be upset. Obviously I'm not, as I'm hoping I won't be made redundant, if it does happen then I'll be working very hard to get another job and certainly avoiding stressing young dc about it.
My technique over the years has been to distance myself from her and tell her as little as possible. If anyone has any other pointers or suggestions much appreciated! I haven't gone completely NC due to her age and a (probably misplaced) sense of duty.