My own life has in some ways been a decades-long tour of the sibling experience. I have full sibs I have half-sibs and for a time I had step-sibs.
An error does not become truth by reason of multiplied propagation nor does truth become error because nobody sees it.
It is unwise to be too sure of one's own wisdom. It is healthy to be reminded...
Tell the truth work hard and come to dinner on time.