When I threaten I the sinner with doom of death, it is for thee to give him word, and warn him, as he loves his life, to have done with sinning. If not, he shall die as he deserves, but for his undoing thyself shalt be called to account. If thou warn him, and leave his rebellious sinning he will not, die he shall as he deserves, and thou go free.
Is it a mortal sin to be too cowardly to tell my father and siblings that eating meat on Lenten Fridays is a sin?
Is it a moral sin not to warn others of sins in general?