My information comes from an extensive NSPCC survey, but I don't think the two contradict each other - the question is the exact definition of abuse that is being used and I should have looked it up and been more precise about that.
Without going back and digging up the exact NSPCC survey, the article you in to appears to take into account a much wider set of criteria, though it's hard to say since it doesn't state its definition either and I couldn't find its source. The wording does also seem to imply that it is looking at reported cases as opposed to use a survey, which would give different numbers.
In terms of type of abuse you consider, it will drastically shift the balance. E.g. for sexual abuse the numbers are completely dominated by male family members. Once you add in violence it shifts a lot, and other neglect will likely shift it further if for no other reason than simply because women are still more likely to be the primary carer.
Of course in any case it doesn't alter the main point.
You're right about it being close family members, but the rest of your profile is wrong.
The majority of child abusers are female: http://www.safehorizon.org/page/child-abuse-facts-56.html