Given the task definition and input, reply with output. In this task, you will be presented with a context passage, a question about that paragraph, and a possible answer to that question. The task is to check the validity of the answer. Answer with "Yes" or "No".

A married couple and their three young adult children , a son and two daughters , live in a large compound with a garden and a swimming pool .  A tall fence surrounds the property and the children have never been on the other side of it , for their parents have kept them unaware of the outside world , even of the existence of the telephone .  They are taught different meanings for everyday words .  For example , they are told that a `` zombie '' is `` a small yellow flower , '' and that `` sea '' is a chair .  The parents promise that each child will be ready to venture outside the compound once she or he has lost a dogtooth .  Although the children are told they have a brother just on the other side of the barrier , he never appears .  The only non-family member to come into the house is Christina , a young woman who works as a security guard at the father's factory .  She is driven by the father to the compound traveling both ways blindfolded where she performs sexual favors for the son .  Dissatisfied with his preference for intercourse , Christina seeks oral sex from the elder daughter in exchange for a headband.  The elder daughter obliges but does not recognize the significance of performing cunnilingus .  Later , she gives the headband to her younger sister , in exchange for being licked on the shoulder , Which is marked by an unexplained scar .  The parents have tricked the children into believing that overhead planes are merely toys .  They allow the children to search for toy planes that they have planted on the grounds , and the child that finds the toy owns it . <sep>Who gives the younger sister a headband and where did they get it?<sep>Christina

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
No