This issue was raised when the ad came out, and there is a distinct difference. The Dear Sophie account is not an account that is used by a child, it is one that is used by a child's father, and therefore allowed.
The real question is why did the OP even set up Google+ for an account intended to document their child's growth, and once they did, set it up as if the Google+ account was their child's.
Of course google's famous policy of no tech support contact is good at making sure disputing is as painful as possible.