Two Momommies

When I was a little girl, my mom tried to explain my relation to my grandmother by saying "This is my mommy." I thought that was her name, and it stuck. So my brother and I have always called her Momommy. I've never met another Momommy until yesterday. Yesterday our family celebrated Thanksgiving with Momommy and her nursing home roommate and one of her family members. Now I have finally met another Momommy... and it's my grandmother's roommate! And she got her name in the same way. Anyone else ever heard of a momommy?