Having a strong stable and honest family history are essential parts of growing up...

I'd say desirable rather than essential - and I'd put "strong and stable" a long way ahead of "honest" (much closer to "essential" than "honest", which is well towards the "desirable" end). And "strong and stable" could be grounds for a mother deciding to keep quiet about any lingering doubts she might have about the child's paternity. As many thousands of mothers over the ages have done when this situation has arisen.

As the old saying goes "It's a wise child that knows its own father".

My point is - in keeping with what I'd said in that last bit lox quoted - we just don't have the information to make these kind of judgements about the mother whether or not this would have been a wrong decision, in this particular case.