Cleaning is work! Why bother? It's your tree, after all, and you can build it any way you want!  That's true, but most of us want to share our research with others and find cousins to collaborate with! And to do that successfully, we need to clear out duplicate people,  extraneous relationships (such as step-parents who didn't raise the children),  alternative facts (such as a vague "abt. 1882") when we have the precise date of birth, immigration, marriage, or death. Having accurate, clear facts and sources make it possible to tell the story of our ancestors better. And if you are working in an online genealogy site, a clean tree will allow their matching algorithms to get you the best hints to more sources, and more cousin  matches . Best Practices Be sure to list each woman with her birth surname; if you do not not know it, leave it blank. If you know only the married name, link her to a spouse with that surname and if you do not know his forename, lea...