Categorize the following into a family tree.
Grandpa, Mom, Sister, Son
Grandpa
|
Mom
|
|--Sister
|--Son
Complete the following task based on the instruction and optional input provided.### Instruction:
Categorize the following into a family tree.

### Input:
Grandpa, Mom, Sister, Son

### Output:
Grandpa
|
Mom
|
|--Sister
|--Son