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[text] Cycles in family tree software Asked 12 years 7 months ago Modified 8 years 5 months ago Viewed 286k times 1590 votes Locked. This question and its answers are locked because the question is offtopic but has historical significance. It is not currently accepting new answers or interactions. Iam the developer of some family tree software written in C and Qt. had no problems until one of my customers mailed me a bug report. The problem is that the customer has two children with their own daughter and as a result he cant use my software because of errors. Those errors are the result of my various assertions and invariants about the family graph being processed for example after walking a cycle the program states that X cant be both father and grandfather of Y. How can resolve those errors without removing all data assertions c graph cyde assertions familytree