WHEN HANNAH AND HENRY were children, I talked a lot about money. This was partly self-preservation: It would have been embarrassing if the kids of a personal-finance columnist grew up to be financial ne’er-do-wells. Fortunately, they didn’t. Hannah and Henry are now in their 30s. Both have good financial habits, and today I typically don’t talk to them about money except when they have questions. Still, given my cancer diagnosis, perhaps a few final reminders are in order—13,