'Mother's' in the Bible

“Scarcely had I passed themWhen I found him whom my soul loves.I held on to him and would not let him goUntil I had brought him to my mother’s house,And into the chamber of her who conceived me.”

(The Shulammite Bride)“I was asleep, but my heart was awake.A voice [in my dream]! My beloved was knocking:‘Open to me, my sister, my darling,My dove, my perfect one!For my head is drenched with the [heavy night] dew;My hair [is covered] with the dampness of the night.’

(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]?