I think many will believe the boy was the target because it's hard to comprehend that even those that live in large, impressive homes can be victims of such a brutal crime. Plus, it makes better copy than 'drug related.'
Sorry, it's been a long time since I read about this tragic crime.
The story about Shirlee being the target, rings some truth, IMHO. I can't recall, did they take the money in her purse?
IF the motive was in fact drugs and $$ and or murder, would explain why nothing from the home was taken. LE solves crimes all the time by finding the 'fence,' from the proceeds of a crime. Cash doesn't link back to anyone, unless it's bait from LE and the serial #'s have been noted and, or a bank heist where there's a die pack.
The poor child was most likely collateral damage.
IF it was for 'drugs,' wonder why LE hasn't been able to solve the case? Seems it should be pretty straight forward. That is unless, the person in her family alleged to have a drug problem, cares more about themselves than who murdered these two victims and justice.
JMHO
fran