Kemove K87 with Red switches and o-rings at work. Keeps noise down and the tenkeyless layout is a nice compromise between desk space and functionality. Might switch it out for an ikbc tenkeyless with Cherry MX Silent Red switches that I got for cheap once. That I purchased to see if something without o-rings would feel better, but I'll have to fix a couple broken switches first.
At home, a no-name tenkeyless with blue switches because that was what was on discount and I didn't mind the clicking. Before that, I used a Monoprice full-size with brown switches and o-rings to keep the loud pinging down. Miss the feel of the brown switches, but not how much space it took on my desk.
I originally worried that my typing accuracy would suffer on the reds due to the lack of tactile bump, but I'm growing to prefer it since I don't find myself making more typos, while the low actuation force makes long typing sessions more comfortable. Haven't looked at more niche low-profile, etc. options though, can't quite convince myself to drop more than $50 on a keyboard.
My uncle has worked many years in IT and sometimes lectures me on digital privacy and security. But I got a glimpse of his phones and computers, it was disappointing. Bogus security apps and optimizations and a refusal to update Windows. Probably different situation with OP's father, but quite emphasizes the importance of continuing education.