Blood types are no guarantee of paternity without an accompanying DNA test. Also, this episode states that Ridge is type B (+ or -), but in 1998, it was stated that Ridge was NOT type B (+ or -). Since the blood type for all the Forrester children was known by each of them when Rick needed a kidney transplant in 1998 (everyone matched back then BUT Rick, who was B- like Brooke), it's a clear continuity error that no one in the Forrester family has ever glommed on to the fact that Ridge's blood doesn't match.
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