[a].
The Greek word for "brother or sister" ("adelphos" ) refers here to a believer, whether man or woman, as part of God’s family; also in verse 11; and in 3:15, 17; 4:20; 5:16.
[b].
The Greek word for "brother and sister" ("adelphos" ) refers here to a believer, whether man or woman, as part of God’s family; also in 3:10; 4:20, 21.