Decoding the Expression: P $ Z + Q $ B

We are given the following relationship codes:

• 'C $ D' means 'C is the brother of D'
• 'C + D' means 'C is the father of D'

Let's break down the given expression '$P $ Z + Q $ B$' step-by-step:

1. $P $ Z$: This means 'P is the brother of Z'. From this, we know P is male.
2. $Z + Q$: This means 'Z is the father of Q'. From this, we know Z is male.
3. $Q $ B$: This means 'Q is the brother of B'. From this, we know Q is male.

Determining the Relationship: P to B

Now, let's combine these facts to find the relationship between P and B:

• P is the brother of Z.
• Z is the father of Q.
• Therefore, P is the brother of Q's father. This makes P the paternal uncle of Q.
• Since Q is the brother of B, P is also the paternal uncle of B.

The relationship is confirmed: P is the paternal uncle of B.