Good luck to somebody

[ohmyrichard]

Hi, everyone. My pen pal tells me that her husband will have his dental surgery tomorrow. As I will write a reply letter to her, rather than her husband Mike, it may not be appropriate to say only "Good luck!" at the end of the letter. I plan to say "Good luck to Mike! I hope his dental surgery goes well tomorrow", but my Oxford and Longman dictionaries both tell me that "good luck to somebody" means that you do not mind what someone does, because it does not affect you and may help them. The Longman dictionary gives an example sentence after this explanation: Well, if she wants to go on her own, good luck to her, but I'm staying here. Oxford's example sentence is "It's not something I would care to try myself but if she wants to, good luck to her."
What do native speakers of English say when they are in my current situation? I'm confused about it. You guys, please help me out.
Thanks.
Richard

[Kazuki]

"I wish him the best of luck"

Not a teacher.

[moniza]

"I wish him the best of luck"

Not a teacher.

"wish your husband the best of luckwith his surgery"
not a teacher