What would you write in a letter to the grandparents of your baby who dont know they have a grandbaby?

I want to write a letter to the grandparents of my baby who don't know they have a grandchild. However, I am not sure how to address the letter or how exactly do I let them know they have a granddaughter.

My baby's dad and I had a big falling out, he refuses to have anything to do with our daughter. At the same time he won't tell his parents they have a grandchild. I feel they have the right to know, but I just don't know what exactly to say to them.

What would you write in a letter to the grandparents of your baby who dont know they have a grandbaby?
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