There is no law but that of love.
Love is joy in others.
Passing on the joy that the presence of the others brings us means words of love. Thus words of anger and worry about members of the brotherhood are out of the question. Talking in one's own family is no exception to this either. Without the commandment of silence there is no faithfulness and thus no community. The only possible way is direct address as the spontaneous brotherly service to the one whose weaknesses cause something in us to react negatively.