'Stepbrothers' in the Bible

“Do not gaze at me because I am deeply tanned,[I have worked in] the sun; it has left its mark on me.My mother’s sons were angry with me;They made me keeper of the vineyards,But my own vineyard (my complexion) I have not kept.”

(The Chorus)“We have a little sisterAnd she has no breasts.What shall we do for our sisterOn the day when she is spoken for [in marriage]?