It is a fine point but before the obots raise it as mis-information let me hasten to say that the newspaper reports of bo’s birth would be admissible.
If I were arguing the case, I would admit them because they show nothing but intent on the grandparents to cover up.
The newspaper announcement does not help bo’s case, it hurts it.
Why would the grandparents want to "cover up"? That question has to be answered in a way that makes sense to the "reasonable man".