AITAH-Not wishing happy Mother’s Day.

Context: my family and I use to be very close. Exactly 11 years ago yesterday my dad passed unexpectedly. He was my rock my best friend my everything. Ironically right before he passed and and my mother did their will. He made sure to have my sister, my 2 nephews and myself on the deed as joint tenants. As soon as he passed things fell apart mainly because my marriage ended and my stepdaughter and myself youngest nephew got together. They are now married but their relationship and the end of mine put a big wedge in my family. There is so much context here but it’s too Jerry Springer. Anywho, last Friday I was blindsided when I received a letter in the mail from an estate planning lawyer that my mother was requesting for me to give up my share on the house and remove me from the deed to my sister and nephews. When I questioned her she lied and then gaslit me. She just turned it into this “why I am so bad” thing. She lied about what this letter really meant like I was stupid. This is against my fathers wishes. I don’t care about money or the house I care about the mistreatment of me and disrespecting what my dad would do. So I am not feeling all that “hey mom happy Mother’s Day for being a shitty mom”. AITAH?