Further to my last point. If you arrive at an unknown parent the tree can not be drawn with names, which is the same when you arrive at a living descendant with no children.
However unlike the future, in the past you can assume an infinate tree of individuals having two parents. The only thing you can't know is some of the unknown people could in fact be the same person. E.g. one man/woman could be the father/mother in more than one family branch. Given this fact you can generate a backward tree for every individual until you arrive at two unknown parents. It is thus possible to navigate a tree backwards in time, then forwards in time but only so far as you return to and use two unknown biological parents. Remember we can have full siblings for which we have unknown fathers, especialy when a woman has a multiple birth such as twins (maternal and fraternal) because they do have the same parents. I know this because this is how we found our relatives via a twin. The future will be more complex with children with three biological parents already possible, not to mention birth mother and genetic mothers and parent vs genetic fathers being different. I am working to simplify this, although it may not look like it. tony -- You received this message because you are subscribed to the Google Groups "TiddlyWiki" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/tiddlywiki/5f67b137-a52a-4729-be9f-0dbb5253ad0f%40googlegroups.com.
