This reminds me of an AITA reddit post where for each kid's birthday the kid was supposed to buy their mom a present to celebrate the anniversary of the mom birthing the kid.
This is like those diamond commercials; "Oh it's your anniversary? You should get your wife a diamond, but since she's your best friend too, you have to get her TWO diamonds!"
I'd Say maybE get an eXtra Special gift for the tWo of you to use joIntly, Now that you'll have a Greater amount of free time
This is like having to buy the mom a gift when she gives birth.