Why do they call it Mother's Day?

I was hearing about this really important day called Mother's Day.  It seemed like everyone was talking about it, and they said it was really special for Mom, because it was her first.  But when it finally came, I thought the day was more about me then Mom, so why do they call it Mother's Day?

Let me go into a little detail about how the day went.  I woke up in the morning and Mom quickly arrived to feed me breakfast in bed.  Then Dad got up shortly after that to fry some eggs.  He knows that I love eating eggs, so he made enough for both him and Mom to feed me.  They took me outside to enjoy my bagel while they both looked at me lovingly.  Then we moved on to the morning play, where I got to try out the new hat and toys that Grandma Jean sent.

The morning was quickly fading, and I was getting sleepy, as Mom and Dad were getting all my stuff ready for the day's hike.  They said that we were going to start a new tradition of hiking to a waterfall on Mother's Day.  Just as I was about to fall asleep they loaded me into the car.  There is something special about the car's rumble that just soothes me to sleep.

When I woke up, we were at the hiking spot, and Mom and Dad suited up, which took way too long.  I got to ride in my favorite position on Mom's tummy in the Ergo, or is my favorite position on Dad's shoulder?  Either way, I got to ride in my favorite place.  Dad also taught me a new game of spinning circles.  This dizzy feeling is going to have to be explored thoroughly.

All in all it was a really good day.  I can't wait for next year's Mother's Day, or should we call it Dustin's Day?