Exhort Women
1Tim 5:2 older women as mothers, younger as sisters, with all purity.
It's not appropriate to sharply rebuke or otherwise chide one's mother. So also in the family of God. And these are in fact mothers. For Jesus said, "For whoever does the will of My Father in heaven is My brother and sister and mother." Mt 12:50
Concerning sisters he adds "with all purity", given that sisters in the faith are potential mates. And thus one must give particular attention to the sexual purity of such relationships.