Do you know how sometimes we have to find a book in a big library with lots of shelves and books? Well, people who are interested in tracing their family tree use something kind of similar to a library system to keep track of all their family members!
It's called a genealogical numbering system. It's a way of giving a special number to each person in your family tree so you can easily find them and see how they're related to each other.
Now, let me explain it like you're five years old. Imagine, you have a big family tree that has lots of branches and lots of members. Each member has their own unique number.
For example, if you start with yourself, you are number one. If you have parents, they would be number two and number three. If they have parents, your grandparents, they would be four, five, six and seven. The way the numbers are assigned depends on where the person falls in the tree, and if they are on your mom's or dad's side.
So, basically, it's like a secret code system that helps you keep track of all the different family members in your family tree. That way, you can see how everyone is related to each other and how your family has grown over time. Cool, huh?