TonyM,
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.
>
You may have touched an important thing: Originally, I thought it was
difficult to deal with an unknown ancestor because we store the ancestors
of the entities ("parents" field), but if we instead store the children of
the entities ("children" field), we run into the same problem because there
is no ancestor, to indicate his children. So it is harder to handle that a
tree has no root than it has "no leaves" (which is practically impossible
if the tree is not a single entity). I have a feeling that we have to
search for a solution in the field of graph theory.
> 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.
>
Increasingly, I have the feeling that the lines of the chart need to be
stored somehow, so who they are connecting. (see "parents", "parents
relationship" and "children" fields
in https://groups.google.com/d/msg/tiddlywiki/R0K_mAlDH1k/IOsgRi14BAAJ). If
the relationship itself was a separate tiddler, it could be assigned a
date, an infinite number of participants, unique information (who the
bridesmaid was at the wedding).
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