Well, considering me and my mother haven't spoken in almost a year I think, I might have to use Mother's Day as the only way to tell her I'm moving away. Was hoping to avoid it, but I'm too considerate to just move and not tell her, though that didn't stop her from doing the same. But it's whatever, I've been happier since she moved out. (Though she has probably been telling my sisters what a horrible son I am, and how I betrayed her, and was siding with her ex. *Shrugs*)
For everyone else, I hope that your Mother's Day goes far better than mine inevitably will.