Let me work through this step-by-step.

Sally has 3 brothers.

Each of Sally's brothers has 2 sisters.

Since Sally is a girl, she is one of the sisters that each brother has.

If each brother has 2 sisters total, and Sally is one of them, then there must be 1 other sister besides Sally.

Therefore, Sally has 1 sister.

Sally has 1 sister.

Here is the breakdown:

1. If each brother has 2 sisters, that means there are 2 girls in total in the family.
2. Sally is one of those girls.
3. Therefore, the other girl is Sally's only sister.

Here are 5 jokes:

1. Why don't scientists trust atoms? Because they make up everything!

2. What do you call a bear with no teeth? A gummy bear!

3. Why did the scarecrow win an award? He was outstanding in his field!

4. What do you call a fake noodle? An impasta!

5. Why don't eggs tell jokes? They'd crack each other up!

All 5 jokes are unique - each one has a different setup and punchline with no repeats.

Here are 5 jokes:

1. Why don't scientists trust atoms? Because they make up everything!
2. I told my wife she was drawing her eyebrows too high. She looked surprised.
3. What do you call a fake noodle? An impasta.
4. Why did the scarecrow win an award? Because he was outstanding in his field.
5. I'm reading a book about anti-gravity. It's impossible to put down.

There are 5 unique jokes.