During a book reading session, the following occurred: Reader 1 read before Reader 3, Reader 2 read after Reader 1, and Reader 4 read after Reader 2. What is the correct order of readers?
In a family, there are four members: P, Q, R, and S. P is the father of Q and R. Q is the daughter of P and S. If R is a son, what is S's relationship to R?