Recently I read this article, which describes the flexible use of the word cousin in African-American and Latinx communities. It made me wonder whether, historically, Jewish communities have had similarly flexible family taxonomies. Would that be on-topic for this forum, and, if not, what would be a more appropriate place to ask?
Unless you ask the question in a way which has direct relevance to Judaism itself, it would probably be off-topic. From the Help Center:
On the other hand, questions unrelated to Judaism, even if they are about...
- other religions
- Hebrew language
- Jews, Jewish history, and Israel
... (examples) are generally off-topic.
See here as well.