You have no proof for your theory for a start, Link is HYLIAN not GERUDO. A gerudo male is born once every 100 years the rest of the species is female they mate with hylians to produce offspring. The likely reason it's the same ganondorf is the dude got sealed away more times than anything and time wouldn't have passed, not to mention he seems to be highly adept at resurrection that or Twinrova. There is no suggestion of a possibility Ganondorf is links father or even a remote hint. In most of the games we see the fact link lives alone clearly old enough to live alone, in only a few games do we see family of links even mentioned such as OOT. In fact aside from OOT i've only seen Links family mentioned twice once in ATTP where he lived with his uncle and in WW where he lived with grandmother and sister. In all Likely hood WW Links mothers is a resident of Outset though we can't claim it for sure, in ALTTP i am almost certain that links family were descended from the hylian knights who fought in the imprisoning war.
In the case of Link he has always had the hero's spirit passed on from one to another, hell we even have links from TP Link to OOT link. Link (aside from some pottery induced evil) has never shown an inclination to aid ganondorf (heh autocorrect seems to thing ganondorf should be Andorran) at all, Both Links and Zeldas line pass down father to son/mother to daughter and in Ganondorf's case he is supposedly forever reincarnated as a form of Hatred for the original Zelda and Link, so yea somehow i don't think Ganondorf would even allow someone like Link to live if he saw him.
We also see that in a somewhat strange fashion the three triforce bearers will recognize one another as foes, in OOT we actually see that Ganondorf doesn't know of link til the lil idiot gets seen at the castle so yea i think i've just killed this theory as good as.
You can now present your evidence.