Kasumi's holotape to grandad is a holotape in the Fallout 4 add-on Far Harbor.
Location[]
The holotape can be found a small table next to a gravestone on a hill just west of the Nakano residence.
Transcript[]
Kasumi Nakano: Granddad. I know you can't hear this, but I can't think of a better way to say goodbye. You taught me so much, and I won't forget any of it. I'm sorry that we'll never be able to fix up the old clunker we've got sitting in the boathouse. Wherever you are, I... I hope you're at peace...