女婿 son-in-law; 媳妇daughter-in-law 姊夫/妹夫 brother-in-law; 嫂子 sister-in-law; 堂兄弟姊妹cousin; 独生子only son; 血亲 blood relative; 单亲 single parent 继子 stepson; 继女 stepdaughter; 亲生父母 birth parents; 养父母 adoptive parents ; 寡妇 widow ; 鳏夫widower ; 外公 grandfather; 外婆 grandmother; 养父母adoptive parents; 养子adopted child