My sister texted me last night with an invitation to watch our dad give his first ever public talk.
I don't live particularly near to my family, but I'm not too far from them to make the journey, and I am on good terms with them, having never been baptized and so not disfellowshipped; they don't shun me and likely wouldn't even if I were disfellowshipped, it's not in their character.
This is the half hour Public Talk? First time? Hell yeah I'd go. A first public talk for an older guy is probably a big deal for him. For a half hour or so you can offer a little support. The second and third talk your not going to attend.
Your family treats you with respect. And you do plan on attending Funerals and Weddings related to your family right?
I'd say attend for your Dad's sake.
Later on you can tell him it was his birthday present lol.