Bible Dictionaries
Sister

Vine's Expository Dictionary of NT Words

1: ἀδελφή

(Strong's #79 — Noun Feminine — adelphe — ad-el-fay' )

is used (a) of natural relationship, e.g., Matthew 19:29; of the "sisters" of Christ, the children of Joseph and Mary after the virgin birth of Christ, e.g., Matthew 13:56; (b) of "spiritual kinship" with Christ, an affinity marked by the fulfillment of the will of the Father, Matthew 12:50; Mark 3:35; of spiritual relationship based upon faith in Christ, Romans 16:1; 1 Corinthians 7:15; 9:5 , AV and RV marg.; James 2:15; Philemon 1:2 , RV.

Note: In Colossians 4:10 , AV, anepsios (cp. Lat., nepos, whence Eng., "nephew"), "a cousin" (so, RV), is translated "sister's son." See COUSIN.

Bibliography Information
Vines, W. E., M. A. Entry for 'Sister'. Vine's Expository Dictionary of NT Words. https://www.studylight.org/​dictionaries/​eng/​ved/​s/sister.html. 1940.