Welcome, Eric! It's always gratifying to see younger men embracing traditional wetshaving, though I think what is practiced here would more accurately be described as enhanced traditional wetshaving.
I, too, started shaving in the 1960s when the choices were a Schick Injector or a Gillette double-edge. I started with the former and later used the latter, even using a brush and soap or cream. I eventually strayed into other tools and methods, but twin-bladed cartridge systems (Gillette Atra and Schick Tracer) were my limit.
My idea of a shave before finding my way here was that it be as simple and quick a task as possible. I only did one pass, with perhaps a bit of touch-up, and I gave it no more thought. This forum is where I was introduced to the concept of a skilled, well-executed shave. I finally learned how to make good lather and I learned how to get the most out of a double-edge razor.
In terms of bringing your father back into the fold, he may not be interested if he just wants a simple shave. I find, however, that a razor with a single blade, wielded with skill and attention, enables me to get the best shave.
Note that we do have members who have found that cartridge razors still work best for them, as one remains free to blend both modern and traditional elements in his shave if he so desires.
Give me Soap or give me death!