Joestar family tree explained

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This contains spoilers for jojo up to part 5

DISCLAIMER: I'm not a fucking scientist- I have basic ideas about genetics but am no way qualified. I may have screwed up somewhere in this theory.

We all know that Josuke is Jotaro's uncle. The family tree is kinda fucked up.
But I haven't heard anyone make the connections between the Joestars and the... well... Giorno is an adopted Joestar too...
So... the connections between the Joestars and the other Joestar

Here's their family tree:

Here's a cousin chart (I hope this loads):

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Here's a cousin chart (I hope this loads):

By putting Josuke/Jotaro in the position of 'self' and finding where Giorno is, we can determine that Giorno is:Jotaro's 1st cousin thrice removed/great grandfathers cousinAndJosuke's 1st cousin twice removed/ grandfather's cousin

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By putting Josuke/Jotaro in the position of 'self' and finding where Giorno is, we can determine that Giorno is:
Jotaro's 1st cousin thrice removed/great grandfathers cousin
And
Josuke's 1st cousin twice removed/ grandfather's cousin

Which is odd in itself. However, this fails to take into account that dio had Jonathon's body when he made Giorno.
Men constantly produce sperm throughout their life and it's made through meiosis (doubling cells but jumbling the dna, basically).  The brain change shouldn't affect this process bc it doesn't make a difference in the dna in the gametes that double. 
This means that the sperm produced is actually Jonathan's, right?? So Giorno is biologically Jonathan's son.

This means that Giorno is George II's brother.
Now if we put him in the place next to George as his sibling, Giorno is actually:
Jotaro's great grand uncle
Josuke's great uncle
AND
Joseph's uncle???

Their ages at the year 2000 are:
Gio - 15
Josuke - 17
Jotaro - 30
Joseph - 80
Jonathan - dead lol
Dio - 132

So uh... this probably makes my realisation worse, huh?

But there's a little hole in my theory: why did his hair change from black to blonde?
It's bc he drinks piss. Some people in Rome would dye their hair with piss so it's not too different.

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