A/N: Thanks for reading. This is just an epilogue.
Robert did, in fact, bury Joseph in that house and then lock it up. There Joseph and his cousin, known as the Vault Dweller, laid to rest for years. Robert would occasionally show up if he needed a place to stay or just to pay respects.
Robert eventually joined the NCR, and by age 50 he was a high military official, famous for many battles. He married a beautiful woman, and had a few kids as well. When he finally died peacefully at age 87, his memoirs were copied and sold throughout the NCR, known as The Ex-Slave Memo.
Robert was laid to rest at Hoover Dam, carrying the Pip-Boy he always had.
The partners' pistols and rifle went through many wars and were eventually retired to the Wasteland museum in Chihuahua, Mexico. These were in a special room with many mementos of the ghoul and Robert. Robert had even found a private journal in the Pip-Boy, which he published with his own memoirs.
Finally, Joseph was found with the Vault Dweller and they both were put with Robert in 3012. The NCR eventually remade the entire space of California, Nevada, New Mexico, and all place between with technology derived from both Joseph's and Robert's journals.