Complete the sentence with Appropriate preposition: My little sister reminds me______ my appointment.

Remind about is typically used when ANOTHER PERSON/THING brings something to your attention or makes you remember something that you must do.

Ex:
- You are reminded about something you must do.
- Please remind me about doing my homework!
- Please remind me about my appointment with the doctor!

Remind of: is used to make someone remember someone that they know or something that happened in the past. Situation: A reminds you of B.

Ex:
- You smell a neighbor cooking a turkey and it reminds you of your last Thanksgiving dinner.
- The turkey cooked during the summer reminded you of last Thanksgiving.