There are resources on sedevacantism included in that answer, and a suggestion that the brother contact Catholic Answers. But you are correct that the answer did not focus on the topic of sedevacantism per se. I chose to focus on what seemed to me to be the inquirer’s more pressing problem: Dealing with unsolicited emails from a relative, which were both impertinent because they sought to tear down the recipient’s faith and burdensome because the single man with lots of free time chose to presume upon the limited free time of a family member shouldering considerable burdens.
Apologetics is not just about engaging in tennis matches with people lobbing objections to the faith across the Internet. Sometimes giving information is the right strategy, but sometimes the right strategy is equipping people to do their own research and find their own answers. It’s a little like the theory of teaching fishing rather than providing free fish. Occasionally, though, the right strategy is to dig under the surface to see if there are other needs that first should be satisfied instead. In the case of a single man with a lot of free time on his hands, perhaps what is needed is a gentle reminder that he has responsibilities to family and/or community that may be going unmet while he picks over obscure theological issues and seeks to make those issues a challenge to the faith of his family (for whom the security of faith should be a comfort in times of stress).
That is why I sometimes choose to offer coping mechanisms for dealing in a constructive manner with relatives, friends, colleagues, acquaintances, etc., rather than offer exact answers to questions that shouldn’t have been asked in the first place of that person in that way.
