In the link I provided.
Wow, how did I miss seeing the link?
Okay, so this is what the author says Robert told him. And he said that Lee brought them home. So it appears to me that this must have been when Robert and Lee both lived with their mother. Long before the assassination.
Still, I don’t remember reading about this in Robert’s book. That’s why I am surprised. Robert believes LHO is guilty. So he wouldn’t have reason to not say something about it in the book.
Oh well, it just goes to show that LHO was interested in guns at an early age. So was I.