It's a shame you have to be afraid of a family member.
I have pepper spray but will look at the tasers. I worry most about my SIL. I get the feeling that she spouted off at his mother because I have heard her do it in the past. She was so mean to my granddaughter that she moved out and moved in with her boyfriend. She became afraid of her mother.
One reason I consider that it is manipulation is that as soon as everybody gives in to her, she’s back to acting like a normal person. She’s a control freak and if you don’t do what she says or you don’t agree with her, she’s back in crazy mode. I stand up to her after I have had enough but I try to let stuff slide to keep her off my SIL. We did that for 18 years to protect our granddaughter. I’m done with the tantrums so it might get ugly. I have enough going on without her tantrums and crazy fits.