2) Nor are we now Grandparents.
She is one of our "virtual" nieces/little sisters.
When we first met her mother 5 years ago, it was "old friends who just met." And we were promptly adopted into their family.
Therefore we wanted to tell the world about her son's arrival.
As we have become Grand "Virtual" Aunt and Uncle.
As to the terseness of the post...
...I created the birth announcement post at 3:30am on my iPhone after a long busy con.