§97, the rules that define the amateur radio service in the US, begin with "Basis and purpose":
The rules and regulations in this part are designed to provide an amateur radio service having a fundamental purpose as expressed in the following principles:
(a) Recognition and enhancement of the value of the amateur service to the public as a voluntary noncommercial communication service, particularly with respect to providing emergency communications.
(b) Continuation and extension of the amateur's proven ability to contribute to the advancement of the radio art.
(c) Encouragement and improvement of the amateur service through rules which provide for advancing skills in both the communication and technical phases of the art.
(d) Expansion of the existing reservoir within the amateur radio service of trained operators, technicians, and electronics experts.
(e) Continuation and extension of the amateur's unique ability to enhance international goodwill.
These five points outline the basis and purpose of the amateur radio service, and they can serve as guidelines for the topics here. Even though the FCC's regulations are local, the intent of the amateur service is largely the same globally. An international statement by the ITU would be better, but while the ITU defines amateur radio identically to the FCC's definition), it has no statement if intent that I can find. So, the FCC's statement of intent will have to do.
Does the question meet any of these intentions?
(a) Does it provide emergency communications as a service to the public? No. It provides emergency communications to one guy and his family. So does a cell phone.
(b) Does it advance the radio art? No. The question does not demonstrate any particular interest in how radio works.
(c) Does it improve the amateur service through rules? No. It's not about regulation of the amateur service.
(d) Does it expand the pool of experienced Amateur operators? No. It is not about advocacy or training.
(e) Does it enhance international goodwill? No. He is communicating only with his family.
There are many questions which may not be directly related to amateur radio, but have relevance to one or more of these points. For example, What is the difference between a scanner and a receiver? While this is a basic question, it does have relevance to "skills in both the communication and technical phases of the art." Although for all we know, the question could have been about public safety, aviation, marine, or military communications, it is equally applicable to ham radio. Likewise, questions about antenna theory, RF electronics and so on can be considered on topic, as they have direct applicability to "the art".
More examples which aren't specifically about just ham radio, but which are on topic here: