Please solve the following problem, giving your reasoning for the solution. Alice has 7 brothers and she also has 5 sisters. How many sisters does Alice's brother have?

The correct answer is below, marked as a spoiler. Before you peek at it, see if you can beat ChatGPT's logic (it got the answer wrong, output below).

Correct answer - six!

And this is what ChatGPT said:

To solve this problem, we need to analyze the relationships in Alice's family. We know the following:

- Alice has 7 brothers.

- Alice has 5 sisters.

Since all of Alice's brothers and sisters are her siblings, we need to consider the total number of female siblings (sisters) each brother has.

Alice's brother would have the same siblings that Alice has, minus himself (since he wouldn't count himself as a sibling). Therefore, each of Alice's brothers has:

- The same 5 sisters that Alice has.

Thus, Alice's brother has 5 sisters.

The answer to the problem is that Alice's brother has 5 sisters.