Guides
Ask a fair question about a family or team
Choose the people before looking for an attractive pattern.
Define the group first
Start with a clear reason for including people: a household, a particular team roster or the cast of a named production. Record that scope before calculating birthdays. If you keep changing the cast until a match appears, the result may be numerically correct while giving a misleading impression of the original group. A small, clearly described selection is more useful than an unexplained collection of famous names.
Keep the unanswered question alive
An introduction can ask whether a date connection exists without promising one. Present people neutrally before the reveal. Then show whichever relationships the calculation supports. If only two people match, keep the others in the concluding overview. Avoid language that treats an unmatched person as an outsider or suggests that a birthday measures affection, loyalty or membership.
Keep a record someone else can check
Save each full name, birthday source and the date the source was checked. For a changing roster, state which selection or season you used. Review every pair before calling a group Never, because an occasional leap-year relationship also counts as a match in some years. If the group contains several kinds of relationship, explain each rather than compressing everything into an Always slogan. A truthful negative result is a complete story, not a production failure.
Sources and checking
Source facts checked 2026-10-18. Editorial draft; final review pending. Calendar comparisons are our calculations. A source supports the recorded date, not a personal relationship or endorsement.
- US Naval Observatory: Leap Years ↗
Gregorian leap rule; weekday conclusions are our calculations.