Happy Mothers/Mother's/Mothers' Day!!!!

[lightning]

Seriously.

To whom this applies,
Happy Mothers/Mother's/Mothers' Day!!!

Since we are academics, I'm curious to know if you type Mothers Day, Mother's Day, or Mothers' Day?

[namazu]

My inclination would be to type "Mothers' Day", but I understand that it's officially "Mother's Day".

It's my first, and I'm feeling grateful that (thanks to all of us being fully vaccinated) I was able to celebrate with my husband, own mom and dad, my MIL, and my aunt and sister, who were meeting their nibling for the first time.