sister n
(also REL) сестра (BRIT, MED) (медицинская or мед-) сестра cpd
half-sister n
(with same mother)
единоутробная сестра , (with same father)
единокровная сестра
sister-in-law n
(brother's wife)
невестка , (husband's sister)
золовка, (wife's sister)
свояченица