The note to Marge is a note in Fallout 76.
Location[]
This note is found in the Vault-Tec Agricultural Research Center on the second floor on a desk next to a working terminal.
Transcript[]
Marge,
I miss you and the boys more than life. Don't think I'm a coward. I'm using what God gave me to help the only way I can. This Agricultural Center's a chance to feed all the people. I'll get it done. I'm close. I can feel it.
-MacFadden