I'm going to have to refer the OP to my mother who still believe that Black Republicans only exist in places where they can be seen like on television, online, and the radio. You rarely find one in public. Well, at least I haven't.
My dad was one. LOL. I need to sit down with him and see why. He oddly supported Mike Huckabee in the 2008 Republican Primary but voted for Obama that fall, voted in 2012 GOP Primary (IDK who) and Romney later that year, voted in 2016 GOP Primary (Don't know who voted for- definitely NOT Trump), and did a write-in that fall (he DESPISED Hillary). Somehow or another he ended up ardently supporting Stacey Abrams (probably because I didn't shut up about her). I'll see if he has fully converted in 2020. He seems to be very skeptical of the entire political process and can be swayed either way. He's not ideological at all and has the mindset that all white people have ulterior motives so "RePuBlICaNS aRE RaCiST" doesn't stick with him.
Aside from that Romney mis-step, your father sounds like the greatest living American.