The statement that best describes this sentence is that The sentence is complete.
It does have a predicate - <em>is a good artist.
</em>It does have a subject - <em>Trevor.
</em><em />It doesn't have a dependent clause, the whole sentence is independent.
I think the answer is the reason for his absence is quite simple to understand.
Guilt i believe because when you feel guilty you have that feeling that you did something wrong or hurtful.
Answer: They should not get involved in the Frank's family issues.
Explanation: If you read, you will find out that they feel like the Frank's have their issues just like other families do so for instance if someone was in their family issues they would get agitated and so stressed out that they understand that the Frank's need time to resolve their family buisness.