Regulus Black's son the HBP

[eabarboza]

No: HPFGUIDX 108027

I have a pretty wild theory, so feel free to tear it up.  

We all know that Siris' death had to happen for a reason.  The only 
thing I could think of is his inheritance.  His death would bring 
out any living relative that he has.  

His brother Regulus Black was a Death Eater, but was killed because 
he tried to get out.  See quote below:

"Sirius jabbed a finger at the very bottom of the tree, at the name 
REGULUS BLACK. A date of death (some fifteen years previously) 
followed the date of birth 
""Was he killed by an Auror?" Harry 
asked tentatively. "Oh, no," Sirius said. "No, he was murdered by 
Voldemort. Or on Voldemort's orders more likely, I doubt Regulus was 
ever important enough to be killed by Voldemort in person. From what 
I found out after he died , he got in so far, then panicked about 
what he was being asked to do and tried to back out Well, you don't 
just hand in your resignation to Voldemort . It's a lifetime of 
service or death ." 

Pages 111-112 of the American Version of Harry Potter and the Order 
of the Phoenix printed by Scholastic Press

I have also found out that Regulus Black actually  
means "the 'little king' a star in the Leo constellation (From the 
Lexicon website).

What if Regulus was trying to get out because he had fallen in love 
with a Muggle.  What if he had a son? His son would be a Half Blood 
and a "prince", not in the literal sense.  He would be the Half 
Blood Prince that would try to claim Sirius' inheritance!

If this is correct, then this new character would be rather upset 
with Voldemort for killing his father.  Therefore, he would be more 
than willing to join in the fight against him. On the other hand, 
this "prince" might detest his Muggle blood just like Voldemort and 
would decide to join the DE.  

What do you guys think of my wild theory?

-Erika