Postcard from grandma is a paper note in Fallout 76.
The note can be found next to a female skeleton on the front porch of a red brick house in Morgantown, to the northeast of the water tower at Morgantown High School.
I am so very proud to hear of your accomplishments at your new school. You are the very first woman in our generation to go to college. Always know I love you and am so happy for you and your future.
Hugs and kisses,