Categorize the following into a family tree.
Grandpa, Mom, Sister, Son
Grandpa 
         - Mom 
                      - Sister 
                               - Son
Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
Categorize the following into a family tree.

### Response:
Grandpa 
         - Mom 
                      - Sister 
                               - Son