One of the blondes was Ruth. Anna 0bama likely wasn’t blonde unless she dyed her hair. Pretty hard to get Oriental black hair blonde, though.
If you read the page of the book I linked to where that comment appears, you'll find it related to Hawaii. The kenyan didn't meet Ruth until some months before he left Boston in August 1964.
Ann S Obama in the Polk in Honolulu at the same time as ANNA OBAMA appears in the Polk in Seattle might be a clue.