Thanks for all your comments. I was trying to think of something that might help reduce duplication. Yes, one should probably do a general search even before starting a profile, but in that case, duplicates can be easier to see when people are sorted by DOB, unless it was the same person who created both the duplicate profiles around the same time. Of course, I have not dealt that much with really common names like John Smith, where it's going to be a headache no matter what. One problem is that even if the two profiles have same date and location of birth and same date and location of death, but one lists parents but no spouse or children, and the other lists the spouse and children, but no parents, somebody will consider them different people. No method of sorting would probably help with that issue.