Hi Sylvia,
I guess that if the new info is relevant to your scavenger hunt - same person etc, then I would add it to the old thread. That will hopefully make sure that people don't duplicate any research already done, and you also have all the known facts to hand as it were.
If it is not really relevant to the scavenger hunt - the 3x gt grandaunt of the person for example

then I would do a new thread (but put a link to the old one).
Hope that makes sense
