Lux, not to digress, but do you think OP (assuming his guilt for a moment ;-)) has confided in a family member? I'm under the impression they are all under his spell.
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Im 99.99% positive that OP has told NO ONE the truth.
As much as he might want to, he simply cannot afford to.
Confession means TOTAL TRUST in someone else ... essentially putting your life in their hands. OP is a control freak - hes not about to do that. Hes lost virtually everything already - he could never take the chance of telling the truth to his family and potentially losing their love and respect forever. Family is all that OP has left - without their 100% support and goodwill hed be out on the street ... not many people would stick their necks out and take in a known killer, no matter how much they profess to Support Oscar and wave white balloons - the guy is toxic. I can guarantee you he has not told the truth to any close friends - way too risky. When it comes to murder, friendship only goes so far, even between best friends (unless, of course, youre of the same narcissistic, murderous mind set).
As far as his family goes, no matter how much he loves them and they love him, he could NEVER be sure about even their support and silence if he spilled his guts. Hes got a very large family and I imagine not all of them share OPs exact values and philosophy. (Hellz, Im not even sure all of them believe his story! Surely, at least a couple have to seriously wonder.) Hes smart enough to know that confession to the wrong person(s) could mean total betrayal - even within his immediate family. He is NOT gonna go there. Even one unintentional slip of the tongue by a trusted family confidant to the wrong person is all it would take for a firestorm to consume the rest of his life. Hes got one thing of value left - freedom - and hes not about to do anything so stupid as confess the brutal truth to jeopardize it. OP is all about image and he will do literally anything to protect it - even LIE to his family.
For a man who did what he did to Reeva Steenkamp and then professed not only innocence to murder but victimization, lying to his family should come smooth and easy.
In fact, I suspect the very LAST people he would ever tell the truth to would be Carl and Aimee - he values their love and respect more than anyone on earth. He simply could not withstand their possible revulsion, hatred and rejection. Yes, theyre siblings and yes, theyre extremely close but even close siblings dont always agree and see eye to eye ... or approve of each others dealings.
Murder is a line the vast majority of humans do not cross - their friendship, love, respect and support is never tested by same. To confess to Carl and Aimee, OP would have to be certain they share the same exact values and mind set, be absolutely certain of their response (who has that kind of guarantee?) - but when it comes to murder, that is truly the ultimate test. OP could never really be 100% certain about even Carl and Aimee.
Is it possible he confessed to Carl and Aimee? Yes.
Is it probable? No.
OP is already a social pariah - he cannot confess and take the terrible chance of becoming an outcast in his own family.
Oscar Pistorius must be a very lonely and yes, alienated man - imprisoned with the TRUTH inside his head.
Then again, playing devils advocate ... perhaps hes already confessed the truth to his immediate family.
After all, the rotted apple doesnt fall far from the rotted tree.