It could appear at first that there is insufficient data to provide a precise figure. But don’t worry, it’s really easy. Similar to the last riddle, this one also tests your reading comprehension although it is more mathematical in nature. Here’s a hint: observe the number that the nouns represent!
Are you prepared for the response? “5” is the response. Mr. Smith has five kids.
Given that the phrase indicates there is a brother for each daughter, most people assume there are eight children. But since they are brothers, each daughter will have a brother even if there is only one! Furthermore, the phrase would need to read, “Every daughter has brothers,” if there were several brothers.
London Bridge

I met a man on London Bridge, goes the riddle. He drew his name and tipped his hat. In the guessing game, he was dishonest. What was the name of the man?
Out of all of them, this one is the most intricate. This one will require you to put your pronunciation to the test in order to find out the answer. Unlike the last one, “man” is not the answer. This has a legitimate name! Finding words or phrases that can sound like a clear, comprehensive response to the question is the suggestion.
Are you prepared for the response? “Andrew” is the response.
You will quickly see why this is the solution if you follow the hint. The second sentence’s phrase “and drew his name” can also sound like “Andrew’s his name” if you put them together. This responds directly to the final query!