De-identify the following text by replacing any words which could reveal a person's identity with a placeholder.
My sister Kathryn attended the University of Washington in Seattle.
My [RELATIVE] [NAME] attended the [EDUCATION INSTITUTION] in [CITY].
Complete the following task based on the instruction and optional input provided.### Instruction:
De-identify the following text by replacing any words which could reveal a person's identity with a placeholder.

### Input:
My sister Kathryn attended the University of Washington in Seattle.

### Output:
My [RELATIVE] [NAME] attended the [EDUCATION INSTITUTION] in [CITY].