Over the past 3 or 4 years my relationship with my siblings have become strained. I no longer visit with my mother due to all the lies she is being told. I chose to stay away for my health and try to give her some peace from siblings putting me under a microscope and telling her lies about me.
Sad.
However, that is hardly the point. The glaring issue in your post is that… sorry, I can hardly believe I'm reading your headline right… wtf??? What do you mean, your 'siblings are changing your 93 year old mother's will…'
Your siblings can't change a single comma in your mother's will. Only your mother can change her will.
If you believe that your siblings are putting pressure on your mother to change her will, and at your mother's age pretty much any pressure is 'undue' pressure, then that's what you need to address. Where are you getting your information?