Read the following context and choose the best option to answer the question.
Context: It seems our sons share their father 's and my sarcastic sense of humour . Perhaps it is a survival skill , but it is a skill they have mastered nonetheless .
Question: Why would the mother be unsure whether to believe her son ?
Options: 
- Her son is a joker .
 - Her son is a liar .
 - None of the above choices .
 - Her son is a con artist .


Her son is a joker .