I foresee a time where playing some twitch games aren't going to work for me anymore. But anything with the slightest hint of tactical gameplay and this oldster-in-the-making will be fine, I think. Especially the Tom Clancy games where "run and gun" just gets you killed more quickly. I look forward to Rainbow Six: Palm Springs with the Naples DLC expansion pack.
Also, have you played Overwatch or TF2? I found both of those more interesting than Titanfall-- and a wise player can really help a team by jumping into the role that isn't present on a team.
Hmmm. So I don't think of Overwatch as a "Hero" type game (although I'm not sure what you mean by that). I think Overwatch classes map to TF2 classes pretty straightforwardly. And there's no leveling or grinding for functional items, so it is maybe even a better than TF2 in that regard?
EDIT: And I missed the part earlier where you asked for tips with your father. Ya know, I gave it some thought, and I don't know that I have any. Your dad is about ten years older than I am, which means he was just a tad past the proper age when the Atari 2600 came out. Me, I grew up with the Sears pong console, then came the day when we got a 2600. I was ten or twelve, just the right age to get hooked. So to me it's "umm, sure, I'm in my fifties and spend way too time playing video games. Your point?" whereas your father might have been just old enough to complain about those "kids and their video games", I don't know. So both he and I have had about fifty years to fall on one side or the other, and neither one of us has probably changed all that much since.
You and I both wonder, "why wouldn't you think Kerbal is cool? Hell, if I were retired, it's all I'd do if I didn't have any discipline." because we're already over the hump of playing to begin with, whereas he hasn't gotten past the barrier of "video games==the devil's tool". Dunno, just spitballing, and unfortunately don't have any potential pearls of wisdom. IOW, I don't get it any more than you do.
It's also got a lot more variety in characters than most similar games, with the cast covering a variety of ethnicities, cultural origins, and ages ranging from 18 or 19 to 60+.
As I've gotten older I've lost the wherewithal to focus on mechanically difficult games like SC2.
I never enjoyed it.
Currently enjoying the apocalyptic wasteland / occasionally broken mess that is H1Z1: King of the Kill