We agreed to disagree, with a compromise that I not let her son (we both have kids from other marriages) touch any of my guns, or even see them if possible. My daughters have both been shooting since they were 7, and they were used to helping me disassemble, clean and reassemble my guns, so that horse was already out of the barn with them.
Over time, I have managed to move her a bit closer to reality. She no longer objects to my carrying when we go out, although she strongly prefers CC to OC. From time to time, she will ask whether I really "need" to carry a gun just to go to XYZ place, but I usually just ignore her and strap on the holster. That's not to say that we don't still have occasional issues, usually triggered by my refusal to eat at a place that has 30.06 posted.