I have a document, compiled my my aunt a few years ago for a cousins' reunion. Her information is pulled from a book published by a distant cousin and self-proclaimed expert on the Brantley family. While entering individuals into Wikitree, a birth and death date, however vague, is required. It doesn't accept UNKNOWN as a choice. What I have been doing is enetering the mother's birth date as the child's birth and death year, with 'AFTER this date' checked. Clearly a child isn't going to be born the same year as their mother, but it gives a general idea what time frame that child was born, rather than it potentially being any one of a hundred people with that similar name (my father's side LOVES the name William).
Is there a clear or standard procedure in these cases?