I find that quite frequently with the really common names in my family-Smith, Jones, Brown, Johnson-to name a few. I have tried repeatedly to inform some tree owners that the James Johnson they have in their tree in 1860 in North Carolina was not my gg grandfather since he was living in Tennessee in 1860 and my great grandfather was living with him. This to no avail since these tree owners pay no attention. Most times it's just an exercise in futility. However, I have had some feedback and corrections on some other families in the last few weeks so sometimes it works.