Constructing a scheme not based on reality- for clowny

In the thread Of Internet Balls and Beer Balls, clowny has taken exception to something I said:

A paternal family tree doesn't exist in reality because in reality it takes a male and female to make a family. Biology 101, just as I have stated several times already.

and

That one can create a paternal family tree does not mean such a tree is a nested hierarchy!

It seems to think they are contradictory.

They are not. For example:

I can construct a scheme containing mythical creatures. Does that mean they exist in reality? No

I can construct a scheme based on Roman "gods" (or Greek "gods"). Does that mean they exist in reality? No

There are many more examples but that should be enough to get my point across- that point being that clowny's thinking is so confined and constrained it is a wonder it knows how to use a computer...