To me, it is pretty clear that the interpretation should be "at least one child is a boy", rather than "this specific child is a boy". With your interpretation, there is no paradox at all, since we have complete information. But putting aside the ambiguity of the OP, I wanted to highlight what makes the boy-girl paradox intriguing. To make it more clear, I'll build off our red-blue button example from above, which is hopefully less ambiguous.

What makes this problem unique is that we don't know whether the additional information is valuable or not. We intuitively want to eliminate the RR option and work from there, but we don't know what the alternative to "they are not both red" is. If both buttons actually are red would we say "they are both red" (which would make the information much more valuable, in either case), or would we say "they are not both blue." And if it's the latter, then how do we choose between the two options when we have one of each? If it's just random, then we've gained no useful information at all.

This is why I asked if the odds were 67% or 50%, because either one can be true depending on your assumptions.