I carry a single action .44 magnum Virginian Dragoon for bears or a Glock 29 chambered. My Dad will not carry chambered no matter how many stories I encounter where an unchambered weapon brought about disastrous consequences for the person carrying the weapon.
Older dads such as I have other issues such as racking a slide with a heavy hammer being part of the strength needed to complete the rack. My hand strength or lack of can easily fail a rack if the hammer is down.
Thus I carry with a cocked hammer on an automatic handgun, and will absolutely not carry with a round in the chamber. Like your dad, I don’t really like carrying with a loaded chamber in a six gun either, but the six gun only has five and single or double action still takes time to pull a heavy trigger or to cock.
After all, a man’s got to know his limitations.