"Her parents' room" 的英文表达是 "her parents' bedroom"。
"Bedroom" 是英语中房间的常用词，它可以用来指睡觉用的房间，它是由 "bed"（床）和 "room"（房间）组成的。
英文例句及中文翻译：
She is in her parents' bedroom. (她在她父母的房间里。)
He wants to paint the walls in his parents' bedroom. (他想在他父母的房间里涂墙。)
Her parents' bedroom is on the second floor of the house. (她父母的房间在房子的二楼。)